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Proceedings Paper

Potential energy surfaces for alkali plus noble gas pairs: a systematic comparison
Author(s): L. Aaron Blank; Gary S. Kedziora; David E. Weeks
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Paper Abstract

Optically Pumped Alkali Lasers (OPAL) involve interactions of alkali atoms with a buffer gas typically consisting of a noble gas together with C2H4. Line broadening mechanisms are of particular interest because they can be used to match a broad optical pumping source with relatively narrow alkali absorption spectra. To better understand the line broadening processes at work in OPAL systems we focus on the noble gas collisional partners. A matrix of potential energy surfaces (PES) has been generated at the multi-configurational self consistent field (MCSCF) level for M + Ng, where M=Li, Na, K, Rb, Cs and Ng=He, Ne, Ar. The PES include the X2Σ ground state surface and the A2II, B2Σ excited state surfaces. In addition to the MCSCF surfaces, PES for Li+He have been calculated at the multi-reference singles and doubles configuration interaction (MRSDCI) level with spin-orbit splitting effects included. These surfaces provide a way to check the qualitative applicability of the MCSCF calculations. They also exhibit the avoided crossing between the B2Σ and A2II1/2 surfaces that is partially responsible for collision induced relaxation from the 2P3/2 to the 2P1/2 atomic levels.

Paper Details

Date Published: 17 February 2010
PDF: 8 pages
Proc. SPIE 7581, High Energy/Average Power Lasers and Intense Beam Applications IV, 75810I (17 February 2010); doi: 10.1117/12.845215
Show Author Affiliations
L. Aaron Blank, Air Force Institute of Technology (United States)
Gary S. Kedziora, High Performance Technologies, Inc. (United States)
David E. Weeks, Air Force Institute of Technology (United States)

Published in SPIE Proceedings Vol. 7581:
High Energy/Average Power Lasers and Intense Beam Applications IV
Steven J. Davis; Michael C. Heaven; J. Thomas Schriempf, Editor(s)

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