Determination of low pressure broadening and shift rates for K, Rb, and Cs collisions with rare gases from Anderson Tallman theory

Gordon D. Hager; Matthew D. Rotondaro; Glen P. Perram

doi:10.1117/12.977905

8 November 2012 Determination of low pressure broadening and shift rates for K, Rb, and Cs collisions with rare gases from Anderson Tallman theory

Gordon D. Hager, Matthew D. Rotondaro, Glen P. Perram

Author Affiliations +

Proceedings Volume 8547, High-Power Lasers 2012: Technology and Systems; 85470A (2012) https://doi.org/10.1117/12.977905
Event: SPIE Security + Defence, 2012, Edinburgh, United Kingdom

Abstract

A mathematical method is described to compute the pressure dependent spectrum of the D₁ and D₂ lines of atomic cesium in the presence of argon. The method is based on the Anderson Tallman unified theory of pressure broadening in which the spectrum is determined form the Fourier transform of the auto-correlation function. The method uses modified potential energy surfaces of the ground and excited states that correlate to the ²S_1/2 ground state and the ²P_1/2 and ²P_3/2excited states at large inter-nuclear separation. These surfaces are used to form interaction difference potentials to determine the auto-correlation function. In addition to being able to compute pressure dependent spectra that exhibit symmetry and far wing structure the method also allows us to compute the low pressure shift and broadening rates of the Lorentzian line core.

Citation Download Citation

Gordon D. Hager, Matthew D. Rotondaro, and Glen P. Perram "Determination of low pressure broadening and shift rates for K, Rb, and Cs collisions with rare gases from Anderson Tallman theory", Proc. SPIE 8547, High-Power Lasers 2012: Technology and Systems, 85470A (8 November 2012); https://doi.org/10.1117/12.977905

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