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AIP conference proceedings

State mixing in Rydberg atom — noble gas collisions

K.-D. Heber, P. J. West, Eckart Matthias

Published Jan 1, 1989• 0 citations
Publisher

Abstract

Pressure shift and broadening rates, caused by thermal collisions with xenon atoms, have been measured for 5snd 1D2 and 5snd 3D2 Rydberg states of SrI in the range 8≤n≤25 by means of Doppler‐free two‐photon excitation and thermionic detection. The results show drastically different resonant collisional admixtures for 1D2 and 3D2 states between 13≤n≤19. Above n=20 non‐resonant systematic deviations of shifts and broadenings between singlet and triplet 5snd states are observed.

DOI
10.1063/1.38628

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Pressure shift and broadening rates, caused by thermal collisions with xenon atoms, have been measured for 5snd 1D2 and 5snd 3D2 Rydberg states of SrI in the range 8≤n≤25 by means of Doppler‐free two‐photon excitation and thermionic detection. The results show drastically different resonant collisional admixtures for 1D2 and 3D2 states between 13≤n≤19. Above n=20 non‐resonant systematic deviations of shifts and broadenings between singlet and triplet 5snd states are observed.
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We apply two-photon resonant nondegenerate four-wave mixing with a resonant intermediate state to the observation of the broadening and shifting of the barium Rydberg level 6s24d 1D2 by collision with argon.The collision broadening and shifting cross sections are measured.This technique is purely optical,and can investigate the pressure dependence of the transverse relaxation rate Γ21 between the Rydberg state and an intermediate state,as well as the transverse relaxation rate Γ20 between the Rydberg state and the ground state.
The technique of Doppler-free two-photon spectroscopy was used to measure rates for line broadenings and frequency shifts of Rydberg levels with pressure. Measurements were made of spectra of 2S^{2}\mathrm{S}2S and 2D^{2}\mathrm{D}2D states (with n\ensuremath{\sim}10--40) for Rb∗∗{\mathrm{Rb}}^{\mathrm{*}\mathrm{*}}Rb∗∗+Rb and K∗∗{\mathrm{K}}^{\mathrm{*}\mathrm{*}}K∗∗+K, and of 2S^{2}\mathrm{S}2S states (with n=14--29) for K∗∗{\mathrm{K}}^{\mathrm{*}\mathrm{*}}K∗∗+Rb. Large oscillations are observed in both broadening and shift rates for n\ensuremath{\sim}20--30 in all series except for the 2D^{2}\mathrm{D}2D series in Rb∗∗{\mathrm{Rb}}^{\mathrm{*}\mathrm{*}}Rb∗∗+Rb. Overall rates for broadening and shift are compared with a theory based on the ``free-electron'' model. The observed oscillations are inconsistent with theories based on the resonance scattering of the Rydberg electron by the perturbing atom. A possible alternative mechanism related to interference in l-mixing collisions is suggested.
We apply two-photon resonant nondegenerate four-wave mixing with a resonant intermediate state to the observation of the broadening and shifting of the barium Rydberg level 6s24d 1 D 2 by collision with argon. The collision broadening and shifting cross sections are measured. This technique is purely optical, and can investigate the pressure dependence of the transverse relaxation rate Γ 21 between the Rydberg state and an intermediate state, as well as the transverse relaxation rate Γ 20 between the Rydberg state and the ground state.