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Proceedings Paper

The role of adiabaticity in alkali atom-fine structure mixing
Author(s): Ben Eshel; David E. Weeks; Glen P. Perram
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Paper Abstract

Fine-structure mixing cross-sections for the alkalis in collisions with the rare gases are reviewed. Included in the review are all the rare gases in collisions with all of the first excited state of the alkalis, the second excited state for K, Rb and Cs and the third excited state for Rb and Cs. The cross-sections are converted to probabilities for energy transfer using a quantum-defect calculated cross-section and are then presented as a function of adiabaticity. The data shows a clear decreasing trend with adiabaticity but secondary factors prevent the probabilities from decreasing as quickly as expected. Polarizability is introduced as a proxy for the secondary influences on the data as it increases with both rare gas partner and alkali excited state. The polarizability is shown to cause the probability of fine structure transition to be higher than expected. An empirical model is introduced and fit to the data. Future work will develop a model using time-independent perturbation theory in order to further develop a physical rational for the dependence of fine structure cross sections on adiabaticity and to further understand the secondary influences on the probability for fine structure transition.

Paper Details

Date Published: 25 February 2014
PDF: 9 pages
Proc. SPIE 8962, High Energy/Average Power Lasers and Intense Beam Applications VII, 896207 (25 February 2014); doi: 10.1117/12.2045115
Show Author Affiliations
Ben Eshel, Air Force Institute of Technology (United States)
David E. Weeks, Air Force Institute of Technology (United States)
Glen P. Perram, Air Force Institute of Technology (United States)

Published in SPIE Proceedings Vol. 8962:
High Energy/Average Power Lasers and Intense Beam Applications VII
Steven J. Davis; Michael C. Heaven; J. Thomas Schriempf, Editor(s)

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