Temple, TX, United States
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Raston P.L.,University of Wyoming | Raston P.L.,University of Adelaide | Kettwich S.C.,University of Wyoming | Kettwich S.C.,Temple College | Anderson D.T.,University of Wyoming
Journal of Molecular Spectroscopy | Year: 2015

We present Fourier-transform infrared (FTIR) spectroscopic studies of the IR-induced Cl + H2(v = 1) → HCl + H reaction in a parahydrogen (pH2) matrix aimed at distinguishing between two proposed reactions mechanisms; direct-IR and vibron-mediated. The Cl atom reactants are produced via 355 nm in situ photolysis of a Cl2 doped pH2 matrix. After photolysis is complete, a long-pass IR filter in the FTIR beam is removed and we measure the ensuing IR-induced reaction kinetics using rapid scan FTIR spectroscopy. We follow both the decay of the Cl atom reactant and growth of the HCl product using the Cl spin-orbit (SO) + Q1(0) and HCl R1(0) transitions, respectively. We show the IR-induced reaction mechanism depends on the spectral profile of the IR radiation; for IR spectral profiles that have significant IR intensities between 4000 and 5000 cm-1 we observe first-order kinetics that are assigned to a vibron-mediated mechanism and for spectral profiles that have significant IR intensities that include the Cl SO + Q1(0) transition near 5094 cm-1 we observe bi-exponential kinetics that are dominated by the direct-IR mechanism at early reaction times. We can distinguish between the two mechanisms using the observed kinetics. We investigate the reaction kinetics for different FTIR optical setups, for a range of sample conditions, and start and stop the IR-induced reaction to investigate the importance of secondary H atom reactions. We also study the IR-induced reaction in Br/Cl co-doped pH2 samples and show the presence of the Br atom quenches the vibron-mediated reaction kinetics presumably because the Br-atoms serve as efficient vibron traps. This paper indicates that in a highly enriched pH2 matrix the H atoms that are produced by the IR-induced Cl atom reaction likely do not play a significant role in the measured reaction kinetics which implies these secondary H atom reactions are highly selective. © 2015 Elsevier Inc. All rights reserved.


News Article | October 29, 2016
Site: www.prweb.com

Online higher education and student resource leader Community for Accredited Online Schools (AccreditedSchoolsOnline.org) has published it’s 2016-2017 Best Ultrasounds Technician Programs lists. Ranking the top 50 two- and four-year programs respectively, the following schools received top marks: Tulsa Community College, Hinds Community College, Pitt Community College, Cincinnati State Technical & Community College, Jones County Junior College; Midland College, Allen College, Palm Beach State College, Bellevue College and Misericordia University. Both on-campus and online programs were evaluated. “The job outlook for ultrasound technicians and sonographers is growing much faster than the national average,” said Doug Jones, CEO and Founder of the Community for Accredited Online Schools. “Our rankings list the programs that are going the extra mile for students, providing top-quality training that is preparing students to enter the workforce quickly and efficiently.” Ultrasound and Sonography programs were compared nationwide, based on more than a dozen qualitative and quantitative data points. Schools were required to meet specific base criteria to qualify; each must be regionally accredited and hold either two- or four-year public or private not-for-profit standing. Each must also offer career placement services for students after graduation. A complete list of the Community for Accredited Online Schools’ 2016-2017 Best Ultrasound Technician Programs is included below. To learn more details on the data comparison, methodology and each school’s placement visit the following page: Two-year schools recognized for the Best Ultrasound Technician Programs 2016-2017: Alvin Community College Angelina College Asheville-Buncombe Technical Community College Blackhawk Technical College Bunker Hill Community College Cape Fear Community College Central New Mexico Community College Chattanooga State Community College Chippewa Valley Technical College Cincinnati State Technical and Community College College of DuPage Cosumnes River College Del Mar College Delaware Technical Community College - Owens Delaware Technical Community College-Stanton/Wilmington Delgado Community College Delta College El Centro College El Paso Community College Gateway Community College H. Councill Trenholm State Technical College Harrisburg Area Community College - Harrisburg Hillsborough Community College Hinds Community College Johnston Community College Jones County Junior College Lansing Community College Lone Star College Lorain County Community College Lurleen B. Wallace Community College Marion Technical College Middlesex Community College Montgomery College New Mexico State University - Dona Ana Owens Community College Pitt Community College Pueblo Community College Red Rocks Community College Santa Barbara City College Southwestern Community College Spokane Community College St. Philip's College State Fair Community College Temple College Triton College Tulsa Community College Tyler Junior College Volunteer State Community College Wallace State Community College - Hanceville Weatherford College Four-year schools recognized for the Best Ultrasound Technician Programs 2016-2017: Allen College Arkansas State University - Main Campus Baker College of Auburn Hills Baptist Memorial College of Health Sciences Bellevue College Benedictine University Broward College College of Southern Nevada Columbia Basin College Concordia University - Ann Arbor Concordia University - Wisconsin Ferris State University Fort Hays State University Grand Valley State University Gulf Coast State College Jackson College Keiser University - Fort Lauderdale Kettering College Lewis University Lewis-Clark State College Lincoln University Miami Dade College Midland College Misericordia University Mount Aloysius College Newman University Oklahoma State University - Oklahoma City Oregon Institute of Technology Palm Beach State College Pensacola State College Polk State College Rochester Institute of Technology Rutgers University - New Brunswick Saint Catharine College Santa Fe College Seattle University St Catherine University St. Luke's College Thomas Jefferson University Trocaire College University of Alaska Anchorage University of Charleston University of Kansas University of Missouri - Columbia University of Oklahoma - Health Sciences Center University of Rio Grande Upstate Medical University Valencia College Washburn University Weber State University About Us: The Community for Accredited Online Schools (AccreditedSchoolsOnline.org) was founded in 2011 to provide students and parents with quality data and information about pursuing an affordable education that has been certified by an accrediting agency. Our community resource materials and tools span topics such as college accreditation, financial aid, opportunities available to veterans, people with disabilities, as well as online learning resources. We feature higher education institutions that have developed online learning programs that include highly trained faculty, new technology and resources, and online support services to help students achieve educational success. environments that include highly trained faculty, new technology and resources, and online support services to help students achieve educational and career success.


News Article | November 22, 2016
Site: www.prweb.com

The Community for Accredited Online Schools (AccreditedSchoolsOnline.org), has named it’s picks for the top Trade & Vocational Training Programs at colleges in Texas for 2016-2017. A total of 62 schools were chosen for displaying excellence in career training in the state, with Midland College, University of Texas at Brownsville (now Rio Grande Valley), LeTourneau University, Tarleton State University and Brazosport College scoring highest among four-year schools and El Paso Community College, Lee College, Texas State Technical College Waco, Houston Community College and Grayson College scoring highest among two-year schools. “Job projections through 2024 show trade industries growing at some of the fastest rates in the country,” said Doug Jones, CEO and Founder of the Community for Accredited Online Schools. “The best trade and vocational programs in Texas are found at both two- and four-year schools, and are noted on our list for their dedication to student success both inside the classroom and after graduation.” The Community for Accredited Online Schools analyzes more than a dozen unique data points to determine their “Best of” rankings. Colleges and universities must be regionally accredited and hold public or private not-for-profit status to qualify. For the Best Trade & Vocational Programs list, schools must also offer career counseling and placement services to students. To determine top programs, each qualifying school is scored and ranked based on statistics most important to student success, such as student-teacher ratios, program variety and graduation rates. Complete rankings of the Best Vocational & Trade School Programs in Texas can be found at the link below, along with more information on the data and methodology used to determine school scores: Alvin Community College Amarillo College Angelina College Brookhaven College Cedar Valley College Central Texas College Coastal Bend College College of the Mainland Collin College Covenant School of Nursing and Allied Health Del Mar College Eastfield College El Centro College El Paso Community College Frank Phillips College Galveston College Grayson College Hill College Houston Community College Howard College Kilgore College Lamar Institute of Technology Lamar State College-Orange Lamar State College - Port Arthur Laredo Community College Lee College Lone Star College Mountain View College Navarro College North Central Texas College North Lake College Northeast Texas Community College Northwest Vista College Odessa College Palo Alto College Panola College Ranger College Remington College - Fort Worth Campus Remington College - Houston Campus Remington College - Houston Southeast Campus Remington College - North Houston Campus Richland College San Antonio College San Jacinto College South Plains College Southwest Texas Junior College St. Philip's College Tarrant County College District Temple College Texarkana College Texas State Technical College - West Texas Texas State Technical College - Harlingen Texas State Technical College - Marshall Texas State Technical College - Waco Trinity Valley Community College Tyler Junior College Vernon College Weatherford College Western Texas College Brazosport College LeTourneau University Midland College Parker University Remington College - Dallas Campus Schreiner University South Texas College Sul Ross State University Tarleton State University The University of Texas at Arlington The University of Texas at Brownsville (now University of Texas Rio Grande Valley) The University of Texas Health Science Center at San Antonio About Us: The Community for Accredited Online Schools (AccreditedSchoolsOnline.org) was founded in 2011 to provide students and parents with quality data and information about pursuing an affordable education that has been certified by an accrediting agency. Our community resource materials and tools span topics such as college accreditation, financial aid, opportunities available to veterans, people with disabilities, as well as online learning resources. We feature higher education institutions that have developed online learning programs that include highly trained faculty, new technology and resources, and online support services to help students achieve educational success. environments that include highly trained faculty, new technology and resources, and online support services to help students achieve educational and career success.


News Article | February 15, 2017
Site: www.prweb.com

The Community for Accredited Online Schools, a leading resource provider for higher education information, has released its list of the Best Online Colleges in Texas for 2017. Highlighting both two- and four-year schools, more than 90 Texas colleges received accolades, with the University of Texas at Austin, Texas A&M University, University of North Texas, Texas Tech University and Baylor University coming in as the top four-year schools and St. Philip’s College, Odessa College, Del Mar College, Western Texas College and Texas State Technical College Waco ranking highest among two-year schools. “About 1.5 million students enrolled in post-secondary education in Texas in fall 2016,” said Doug Jones, CEO and founder of AccreditedSchoolsOnline.org. “As Internet-based coursework becomes more accessible, students may find that online programs suit their needs better. Schools on our list have been ranked for overall quality, providing excellent options for anyone who wants more flexible education options.” To determine the Best Online Schools in Texas, each college in the state was evaluated using over a dozen unique data points to find which schools best meet students’ needs, including graduation rates, career placement services and financial aid availability. AccreditedSchoolsOnline.org also requires each school highlighted on the lists to carry institutional accreditation and hold public or private not-for-profit status. Find each school’s score and ranking or read more about the data and methodology used to determine the lists here: The Best Four-Year Online Schools in Texas for 2017 include the following: Abilene Christian University Angelo State University Baylor University Concordia University-Texas Dallas Baptist University Dallas Christian College Grace School of Theology Houston Baptist University Howard Payne University Lamar University LeTourneau University Lubbock Christian University Messenger College Midwestern State University Our Lady of the Lake University Prairie View A & M University Sam Houston State University Schreiner University Southern Methodist University Southwestern Adventist University Southwestern Assemblies of God University St Mary's University Stephen F Austin State University Sul Ross State University Tarleton State University Texas A & M International University Texas A & M University-College Station Texas A & M University-Commerce Texas A & M University-Corpus Christi Texas A & M University-Kingsville Texas A & M University-Texarkana Texas Christian University Texas Southern University Texas State University Texas Tech University Texas Tech University Health Sciences Center Texas Woman's University The University of Texas at Arlington The University of Texas at Austin The University of Texas at Dallas The University of Texas at El Paso The University of Texas at Tyler The University of Texas Health Science Center at Houston The University of Texas Health Science Center at San Antonio The University of Texas of the Permian Basin The University of Texas Rio Grande Valley Trinity University University of Dallas University of Houston University of Houston-Clear Lake The Best Two-Year Online Schools in Texas for 2017 include the following: Alvin Community College Amarillo College Austin Community College District Central Texas College College of the Mainland Collin College Del Mar College El Paso Community College Frank Phillips College Grayson College Houston Community College Kilgore College Lamar Institute of Technology Lamar State College-Port Arthur Lone Star College Navarro College North Central Texas College Northwest Vista College Odessa College Palo Alto College Panola College San Antonio College South Plains College St Philip's College Tarrant County College District Temple College Texas State Technical College - West Texas Texas State Technical College-Waco Trinity Valley Community College Tyler Junior College Western Texas College ### About Us: AccreditedSchoolsOnline.org was founded in 2011 to provide students and parents with quality data and information about pursuing an affordable, quality education that has been certified by an accrediting agency. Our community resource materials and tools span topics such as college accreditation, financial aid, opportunities available to veterans, people with disabilities, as well as online learning resources. We feature higher education institutions that have developed online learning programs that include highly trained faculty, new technology and resources, and online support services to help students achieve educational success. environments that include highly trained faculty, new technology and resources, and online support services to help students achieve educational and career success.


News Article | October 29, 2016
Site: www.prweb.com

The 2016 ranking of the Best Online Colleges in Texas has been released by leading higher education and online student resource provider, AffordableCollegesOnline.org. Four-year colleges earning the highest marks include the University of Texas of the Permian Basin, the University of Texas, Victoria, and Southwestern Adventist University. Frank Phillips College, Western Texas College and Odessa College received top honors for two-year colleges. Between the two lists, more than 70 colleges in Texas were recognized for their variety of online education options and their strong focus on affordability. "The number of Texans earning college degrees has increased dramatically over the past five years,” said Dan Schuessler, CEO and Founder of AffordableCollegesOnline.org. "We’ve found the schools in Texas who are designing learning options to be more flexible and accessible than ever before, for both in-state students and learners located across the nation.” To earn a place on AffordableCollegesOnline.org’s list, schools are required to meet certain baseline criteria. Colleges must be accredited, public or private not-for-profit institutions. Schools had to also meet baseline affordability standards, offering in-state tuition for under $5,000 per year at two year schools and under $25,000 per year at four year schools. Each college’s ranking is determined by an in-depth analysis of more than a dozen different metrics, ranging from financial aid options to graduation rate to online program variety. The full list of colleges is included below. To see where each ranks specifically and to get more specific details about the methodology used to compare each college, visit the following page: The Best Two-Year Online Colleges in Texas for 2016: Alvin Community College Amarillo College Central Texas College College of the Mainland Collin College Del Mar College El Paso Community College Frank Phillips College Grayson College Houston Community College Kilgore College Lamar Institute of Technology Lone Star College Navarro College North Central Texas College Odessa College Panola College South Plains College Tarrant County College District Temple College Texas State Technical College - Waco Trinity Valley Community College Tyler Junior College Western Texas College The Best Four-Year Online Colleges in Texas for 2016: Amberton University Angelo State University Arlington Baptist College Dallas Baptist University Dallas Christian College Grace School of Theology King's University Lamar University Lubbock Christian University Messenger College Midwestern State University Our Lady of the Lake University Parker University Prairie View A & M University Sam Houston State University South Texas College Southwestern Adventist University Southwestern Assemblies of God University Southwestern Christian College Stephen F. Austin State University Sul Ross State University Tarleton State University Texas A & M University - Central Texas Texas A & M University - College Station Texas A & M University - Commerce Texas A & M University - Corpus Christi Texas A & M University - Kingsville Texas A & M University - Texarkana Texas Tech University Texas Tech University Health Sciences Center Texas Woman's University The University of Texas at Arlington The University of Texas at Brownsville The University of Texas at El Paso The University of Texas at Tyler The University of Texas Health Science Center at Houston The University of Texas Health Science Center at San Antonio The University of Texas MD Anderson Cancer Center The University of Texas Medical Branch The University of Texas of the Permian Basin University of Houston - Clear Lake University of Houston - Downtown University of Houston - Victoria University of North Texas University of North Texas at Dallas Wayland Baptist University West Texas A & M University AffordableCollegesOnline.org began in 2011 to provide quality data and information about pursuing an affordable higher education. Our free community resource materials and tools span topics such as financial aid and college savings, opportunities for veterans and people with disabilities, and online learning resources. We feature higher education institutions that have developed online learning environments that include highly trained faculty, new technology and resources, and online support services to help students achieve educational and career success. We have been featured by nearly 1,100 postsecondary institutions and nearly 120 government organizations.


News Article | November 4, 2016
Site: www.prweb.com

Today Pearson announced a series of webinars that it is hosting in celebration of National Distance Learning Week (NDLW), November 7-11, 2016. The webinars will explore a variety of distance learning topics including emerging distance learning trends, strategies and best practices to engage online students, and new tools designed to enhance the online teaching and learning experience. NDLW is hosted by the United States Distance Learning Association (USDLA) each year to showcase the growth of distance learning and celebrate the accomplishments achieved by K-12, higher education, and corporate online learning leaders. The Art of Virtual Storytelling Monday, November 7, 10-11 a.m. EST Presenter: Kate Nugent, director, product and training, The Ariel Group Participants will learn how to integrate a story into virtual lectures, webinars, 1:1 student coaching sessions and other virtual communications. They will be introduced to powerful storytelling techniques that engage and influence audiences of every size. Storytelling “lights up” every part of the human brain, and the ability to paint a picture for students increases the chances that the learning will stick. Trends in Alternative Credentialing: Benchmarks, Badges, and Noncredit Programming Monday, November 7, 1-2 p.m. EST Presenters: Kyle Peck, co-director, Center for Online Innovation, and professor, Penn State University; Jim Fong, director, Center for Research and Marketing Strategy, UPCEA; and Peter Janzow, senior director, business and market development, Pearson Acclaim Micro-credentials, nano-credentials, badges…staying current on emerging trends in education is a challenge. It is also the life-force of preparing students for an ever-shifting professional landscape. In this session, participants will learn about the driving factors behind the emergence of alternative credentials, how higher education institutions are responding, and hear insights about what’s next. Don’t Overlook Your Help Desk! How Golden Gate University Supports the Demands Their Unique Online Student Population Tuesday, November 8, 1-2 p.m. EST Presenters: Doug Geier, director, eLearning and instructional design, Golden Gate University; and Paulo Dias, managing director, technical services, Pearson In this session, participants will learn how Golden Gate University utilizes help desk services to meet the demands of a unique online student population of adult learners – many of whom work full-time, requiring on demand support, ensuring students get a positive technical support experience for their online programs. The 24/7 help desk support allows the school to offer enhanced technical support, allowing students and faculty to access services outside of regular business hours, 24/7, 365 days a year. Snapchat 101: Engaging Students Online Tuesday, November 8, 1-2 p.m. EST Presenter: Wendy Tietz, Ph.D., professor, accounting, Kent State University Snapchat is currently the number one social media platform used by 16 to 24 year olds and is rapidly gaining users aged 35 years and older. Participants will learn the basics of Snapchat, including how to set up an account, how to communicate with other users, and Snapchat lingo and features (e.g. geofilters, swiping, face lenses) as well as discuss at least four ways that Snapchat can be used to engage students in class using real-life examples. Harnessing the Power of Mobile Devices with Learning Catalytics™ Wednesday, November 9, 10-11 a.m. EST Presenter: Terry Austin, professor, Temple College Austin will describe how encouraging the use of Learning Catalytics on mobile devices can revolutionize student participation as well as team-based learning in the classroom. Ask Me Anything: Online Students Tell All Wednesday, November 9, 1-2 p.m. EST Presenters: Joaquin Van Thienen, Florida International University, Broward Community College; Alexandria Pipitone, Florida International University; Amanda Condon, Arkansas Tech University, University of Arkansas Community College- Hope; Andrea Shaw, director of student programs and partnerships, Pearson; and Gillian Seely, director of content strategy, Pearson Over 5.8 million students are taking at least one distance education course. This session will feature three students currently enrolled in 100 percent online courses, and they will discuss their experiences to help institutions better engage and motivate learners. Participants will also gain insight into recent research on student attitudes toward digital course materials. The Advantages of Using REVEL to Promote Success in Varied Classroom Settings and Environments Thursday, November 10, 10-11 a.m. EST Presenter: Beth King, professor, Columbus Technical College Instructor Beth King will discuss how she implemented REVEL and adjusted instruction to improve performance and engagement in her online and face-to-face Introduction to Music courses at Columbus Technical College. For more information or to register for the webinars, visit this website. Participate in the national conversation by following #NDLW on Twitter. Pearson is the world’s learning company, with expertise in educational courseware and assessment, and a range of teaching and learning services powered by technology. Our mission is to help people make progress through access to better learning. We believe that learning opens up opportunities, creating fulfilling careers and better lives. For more, visit http://www.Pearsoned.com. The United States Distance Learning Association is a non-profit association formed in 1987 and is located in Boston, Massachusetts. USDLA promotes the development and application of distance learning for education and training and serves the needs of the distance learning community by providing advocacy, information, networking and opportunity. Distance learning and training constituencies served include pre-k-12 education, higher and continuing education, home schooling as well as business, corporate, military, government and telehealth markets. The USDLA trademarked logo is the recognized worldwide symbol of dedicated professionals committed to the distance learning industry.


Locklin J.L.,Temple College | Huckabee J.S.,Temple College | Gering E.J.,University of Texas at Austin
Florida Entomologist | Year: 2012

Laboratory based experimental designs typically require large sample sizes of genetically related organisms at the same developmental stage. Several described methods for rearing damselflies have been published, but these methods require laborious techniques when rearing large quantities of damselflies simultaneously. We have developed a relatively easy and inexpensive method for rearing large quantities of a coenagrionid damselfly that streamlines previously published methods and employs new techniques that increase efficiency and yield. Culturing large numbers of damselflies in the laboratory is manageable and opens diverse research avenues.


Veech J.A.,Texas State University | Ott J.R.,Texas State University | Troy J.R.,Texas State University | Troy J.R.,Temple College
Methods in Ecology and Evolution | Year: 2016

Estimating the abundance or density of animal populations is often a fundamental task in ecological research and species conservation. N-mixture models are widely used to estimate the detection probability of individual organisms that thusly leads to more accurate estimates of a species' true abundance. However, individuals likely vary in their probabilities of being detected. During a survey, heterogeneity (variation) in individual detection probability might arise due to conditions of the surveying process; this form of extrinsic heterogeneity can be accounted for by the use of appropriate covariates in the models. In contrast, intrinsic heterogeneity in the detection probabilities of individuals arises when intraspecific variation in behaviour results in individual organisms differing in their latent (inherent) probabilities of being detected. This form of heterogeneity is not tractable by the use of covariates and its possible effects on model performance have not been investigated to date. Using simulated data, we evaluated the performance of Poisson, negative binomial and zero-inflated Poisson versions of N-mixture models under the conditions of intrinsic heterogeneity in individual detection probability. Most versions of N-mixture models performed well in estimating abundance as indicated by relatively low root-mean-square-error values (RMSE < 1). Error distributions indicated a lack of substantial bias and relatively high precision and accuracy when simulated detection probabilities of individuals were high (>0·5) and heterogeneity was random. Otherwise, with structured heterogeneity (particularly positive density dependence) and low detection probabilities (<0·5), model performance was reduced (RMSE > 2). The poorest performing model was the zero-inflated Poisson version of N-mixture model applied to data from low survey effort. Our results suggest that N-mixture models are robust to intrinsic heterogeneity in individual detection probabilities except when the detection probabilities are low. When model-estimated detection probabilities are low (<0·5), model users should be aware that estimates of abundance could be erroneous if there was non-random intrinsic heterogeneity in individual detection probabilities during the surveys. Remedying this situation might require redesigning the basic survey protocol such that it does not rely on behavioural traits (as cues to detection) that are intrinsically variable among individuals. © 2016 The Authors. Methods in Ecology and Evolution © 2016 British Ecological Society


Locklin J.L.,Baylor University | Locklin J.L.,Temple College | Vodopich D.S.,Baylor University
Odonatologica | Year: 2010

Eugregarine parasites infect a wide variety of invertebrates. Some authors suggest that eugregarines are rather harmless, but recent studies suggest otherwise. Among odonate-eugregarine investigations, Zygoptera have been more frequently studied than Anisoptera. Adult dragonfly populations were surveyed for eugregarines at a constructed, flow-through wetland system and the fitness cost of infection was assessed in a common and widespread dragonfly host sp., E simplicicollis. Populations were sampled weekly throughout the flight season. Host fitness parameters measured included wing load, egg size, clutch size, and total egg count. Of the 22 host spp. surveyed, 8 hosted eugregarines and 2 of these odon. spp. were previously undocumented as hosts. While eugregarine parasitism has been shown to exhibit seasonality, parasite prevalence and intensity in E. simplicicollis in this study showed no seasonal trend. The fitness parameters measured were not correlated with the presence or intensity of eugregarines. These findings suggest that either eugregarines do not affect wing loading and egg production in E. simplicicollis, or that virulence depends on parasite intensity and/or the specific eugregarine spp. infecting the hosts.


Kettwich S.C.,Temple College | Kettwich S.C.,University of Wyoming | Anderson D.T.,University of Wyoming | Walker M.A.,Manly Astrophysics | Tuntsov A.V.,Manly Astrophysics
Monthly Notices of the Royal Astronomical Society | Year: 2015

We report laboratory measurements of the absorption coefficient of solid para-H2, within the wavelength range from 1 to 16.7 μm, at high spectral resolution. In addition to the narrow rovibrational lines of H2 which are familiar from gas-phase spectroscopy, the data manifest double transitions and broad phonon branches that are characteristic specifically of hydrogen in the solid phase. These transitions are of interest because they provide a spectral signaturewhich is independent of the impurity content of the matrix.We have used our data, in combination with a model of the ultraviolet absorptions of the H2 molecule, to construct the dielectric function of solid para-H2 over a broad range of frequencies. Our results will be useful in determining the electromagnetic response of small particles of solid hydrogen. The dielectric function makes it clear that pure H2 dust would contribute to infrared (IR) extinction predominantly by scattering starlight, rather than absorbing it, and the characteristic IR absorption spectrum of the hydrogen matrix itself will be difficult to observe.

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