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Borovik A.A.,Institute of Electronic Physics | Ogurtsov G.N.,RAS Ioffe Physical - Technical Institute
Journal of Physics B: Atomic, Molecular and Optical Physics | Year: 2010

The energy shift of lines arising from the decay of the (np5(n + 1)s2)2P3/2 autoionizing states in Na (n = 2) and Cs (n = 5) atoms has been studied for the first time in ejected-electron spectra measured over the excess energy range -0.1 to 5.4 eV. In Na spectra, the energy dependence of the shift possesses a clear oscillatory-like character. In particular, the shift becomes of negative or positive sign depending on the presence or absence of a negative-ion resonance structure in the excitation function of the (2p53s2)2P3/2 state. Earlier, we reported a similar behaviour of the line shift for the (3p 54s2)2P3/2 autoionizing state in K atoms. Though in Cs atoms the strong negative-ion resonance is also present close to the excitation threshold of the (5p56s2) 2P3/2 state, in contrast to Na and K data, the energy dependence of the line shift possesses a smooth asymptotic behaviour described well by the classical model of the post-collision effect. The comparative analysis of the spectroscopic classification of the resonance structure in the excitation of the (np5(n + 1)s2)2P 3/2 autoionizing states in Na, K and Cs atoms has shown that the observed effect most probably reflects the complication of the compound character of resonances. In whole, the obtained data show that under the condition of the high polarizability of a resonantly excited target the relation between polarization attraction, centrifugal and Coulomb repulsion becomes a crucial factor which determines the final energy distribution of outgoing electrons. © 2010 IOP Publishing Ltd. Source


Borovik A.,Institute of Electronic Physics | Kupliauskien A.,Vilnius University | Zatsarinny O.,Drake University
Journal of Physics: Conference Series | Year: 2012

By comparative analyzing of experimental and calculated data on excitation functions, energies, cross sections and decay rates, the spectroscopic classification for the 4p55d6s, 6s6d, 6s6p lowest autoionizing levels in cesium has been revised. Strong configuration-mixing and relativistic effects which accompany the electron impact excitation of the 5p6 subshell result in the essential different character of the level structure if comparing with other alkali atoms. Source


Borovik A.,Institute of Electronic Physics | Kupliauskien A.,Vilnius University
Journal of Physics: Conference Series | Year: 2014

The energy-loss spectrum of scattered electrons due to the excitation of the 1sn1l1n2l2 autoionizing states and the ejected-electron spectrum arising from the decay of these states in lithium atoms were measured at scattering angle 54.7° and 80 eV impact energy. A comparative analysis of excitation and decay channels of autoionizing states was performed. © Published under licence by IOP Publishing Ltd. Source


Borovik A.,Institute of Electronic Physics | Kupliauskien A.,Vilnius University
Journal of Physics: Conference Series | Year: 2014

The excitation-autoionization cross section of sodium atoms was studied as a function of the incident electron energy over the range from the lowest autoionization threshold at 30.77 eV up to 400 eV. The present data are compared with the similar excitation-autoionization cross sections for Li, K, Rb, and Cs atoms. © Published under licence by IOP Publishing Ltd. Source


Borovik A.,Institute of Electronic Physics | Kupliauskien A.,Vilnius University
Journal of Physics: Conference Series | Year: 2014

The 2p6 autoionization cross section of Na atoms was measured over the incident electron energy range from the lowest autoionization threshold at 30.77 eV to 37.2 eV. The observed structure was assigned to the negative-ion resonances based upon the lowest autoionizing configurations 2p 53s2 and 2p53s3p. © Published under licence by IOP Publishing Ltd. Source

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