Dissertation/Thesis Abstract

Collisional broadening and shift of D1 and D2 spectral lines in atomic alkali vapor - noble gas systems
by Loper, Robert D., Ph.D., Air Force Institute of Technology, 2013, 184; 3556522
Abstract (Summary)

The Baranger model is used to compute collisional broadening and shift of the D1 and D2 spectral lines of M + Ng, where M = K, Rb, Cs and Ng = He, Ne, Ar, using scattering phase shift differences which are calculated from scattering matrix elements. Scattering matrix elements are calculated using the Channel Packet Method where the collisions are treated non-adiabatically and include spin-orbit and Coriolis couplings. Non-adiabatic wavepacket dynamics are determined using the split-operator method together with a unitary transformation between adiabatic and diabatic representations. Scattering phase shift differences are thermally weighted and integrated over energies ranging from E = 0 Hartree up to E = 0.0075 Hartree and averaged over values of total angular momentum that range from J = 0.5 up to J = 400.5. Phase shifts are extrapolated linearly to provide an approximate extension of the energy regime up to E = 0.012 Hartree. Broadening and shift coefficients are obtained for temperatures ranging from T = 100 K up to T = 800 K and compared with experiment. Predictions from this research find application in laser physics and specifically with improvement of total power output of Optically Pumped Alkali Laser systems.

Indexing (document details)
Advisor: Weeks, David E.
Commitee: Fickus, Matthew C., Perram, Glen P.
School: Air Force Institute of Technology
Department: Engineering Physics (ENP)
School Location: United States -- Ohio
Source: DAI-B 74/07(E), Dissertation Abstracts International
Subjects: Physical chemistry, Quantum physics, Theoretical physics
Keywords: Alkali metal-noble gas system, Collisional line broadening, Non-adiabatic collisions, Optically pumped alkali laser, Shift of D1 and D2 spectral lines
Publication Number: 3556522
ISBN: 978-1-267-98589-7
Copyright © 2021 ProQuest LLC. All rights reserved. Terms and Conditions Privacy Policy Cookie Policy