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Northfield, MN, United States

Carleton College is a private non-sectarian, coeducational, liberal arts college in Northfield, Minnesota. The college enrolls 2,035 undergraduate students, and employs 220 full-time faculty members. In its 2014 edition of college rankings, U.S. News & World Report ranked Carleton College the seventh-best liberal arts college in the United States and ranked Carleton number one for undergraduate teaching at a national liberal arts college. Wikipedia.

Egge E.S.,Carleton College
European Journal of Combinatorics | Year: 2010

We first give a combinatorial interpretation of Everitt, Littlejohn, and Wellman's Legendre-Stirling numbers of the first kind. We then give a combinatorial interpretation of the coefficients of the polynomial analogous to that of the Eulerian numbers, where are Everitt, Littlejohn, and Wellman's Legendre-Stirling numbers of the second kind. Finally we use a result of Bender to show that the limiting distribution of these coefficients as n approaches infinity is the normal distribution. © 2010 Elsevier Ltd.

Tasson J.D.,Carleton College
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

A largely unconstrained set of relativity-violating effects is studied via the gravitomagnetic effect on intrinsic spins. The results of existing comagnetometer experiments are used to place constraints on two new combinations of these effects at the 10% level. We show that planned improvements in these experiments will make them competitive with the best existing sensitivities to this elusive class of relativity-violating effects. Prospects for measuring the conventional general-relativistic gravitomagnetic effect are also considered. © 2012 American Physical Society.

Whited M.T.,Carleton College
Beilstein Journal of Organic Chemistry | Year: 2012

The concept of frustrated Lewis pairs (FLPs) has received considerable attention of late, and numerous reports have demonstrated the power of non- or weakly interacting Lewis acid-base pairs for the cooperative activation of small molecules. Although most studies have focused on the use of organic or main-group FLPs that utilize steric encumbrance to prevent adduct formation, a related strategy can be envisioned for both organic and inorganic complexes, in which "electronic frustration" engenders reactivity consistent with both nucleophilic (basic) and electrophilic (acidic) character. Here we propose that such a description is consistent with the behavior of many coordinatively unsaturated transition-metal species featuring metal-ligand multiple bonds, and we further demonstrate that the resultant reactivity may be a powerful tool for the functionalization of C-H and E-H bonds. © 2012 Whited; licensee Beilstein-Institut.

Christensen N.,Carleton College
Classical and Quantum Gravity | Year: 2010

LIGO recently commenced its sixth science run (S6) simultaneously with Virgo starting its second science run (VSR2). Because of differing interferometer configurations with respect to S5, much effort has been invested understanding new sources of noise in the LIGO S6 interferometers. The LIGO Scientific Collaboration's detector characterization working group is actively investigating the origin of noise in the LIGO interferometers and determining the periods of good, bad or questionable data quality. We describe the instrumental issues found to affect the data quality in S6 and the vetoes developed for burst and inspiral searches. The methods used to search for and identify periodic noise lines are also presented. A summary of other noise search efforts in S6 is also given. © 2010 IOP Publishing Ltd.

Agency: NSF | Branch: Continuing grant | Program: | Phase: Chemical Synthesis | Award Amount: 221.39K | Year: 2016

In this project funded by the Chemical Synthesis Program of the Chemistry Division, Professor Matthew T. Whited of Carleton College works with a research group of undergraduate students to investigate the preparation and reactivity of new complexes featuring transition metal/main-group bonds with acidic and basic sites. In these systems an electron-rich transition metal works synergistically with an electron-poor main-group to facilitate difficult reactions. This allows the development of new selective transformations of industrially and environmentally important molecules such as carbon dioxide and hydrocarbons. This project is developing earth abundant metal catalysts to convert carbon dioxide into chemical feedstocks. This is important contribution to achieving sustainability. As such the project contributes to the Sustainable Chemistry, Engineering, and Materials (SusChEM) effort. Professor Whited is also developing course-based undergraduate research experiences (CUREs) at Carleton College and working with an outreach program to bring local high-school students into Carleton College chemistry laboratories.

This project seeks to understand and develop reactions around late-metal/main-group interactions using complexes featuring constrained metal-silicon single and multiple bonds as prototypes. In order to constrain the metal-silicon linkage, the silyl group is tethered into an easily modified pincer-type ligand. The electronic frustration resulting from the disparity between electron-rich late metals and electropositive silicon, combined with the kinetic lability of bonds to each, allows the development of a cooperative approach to strong-bond activation with applications in catalytic hydrocarbon oxidation and carbon dioxide reduction. Spectroscopic and reactivity studies of metal/silicon systems motivate the expansion of this research to include pincers with boryl and carbyl/carbene donors as well as to catalysis with earth-abundant metals. The project provides a training ground for undergraduate researchers and supports the expansion of both college- and high-school education efforts related to Dr. Whiteds interests in inorganic synthesis and X-ray crystallography.

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