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Journal of the Optical Society of America

Observation of collision-induced 6s–ns transitions in the absorption spectrum of cesium in the presence of xenon

M. A. Dakhil, John F. Kielkopf

Published Jun 1, 1977• 7 citations
Publisher

Abstract

The forbidden transitions of the types 6s–ns have been observed in the absorption spectrum of cesium perturbed by xenon foreign gas for n = 11 to n = 19. The new observed levels agree with an extrapolation of previously known ns levels. These transitions appears to be induced by collisions with xenon perturbers.
DOI
10.1364/josa.67.000844

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Multiple satellites appear in absorption spectra on both components of the Cs $6s\ensuremath{-}9p$ doublet perturbed by xenon at densities of the order of 1019{10}^{19}1019 atoms/cm3{\mathrm{cm}}^{3}cm3. The profiles of these perturbed lines computed with the Anderson-Talman theory, and the density dependence of the absorption at the multiple satellite frequencies, definitely identify the origin of the satellites as the combined additive effect of one to four perturbers.
Observation of the time-dependence of excitation transfer between Cs 7p 2P1/2 and 2P3/2 levels caused by collisions with xenon are reported. The 2P levels were selectively excited with an N2 laser-pumped dye laser, and the spectrum of the fluorescence radiation was observed with 5 nsec time resolution. The lifetimes of the levels were found to be (2P1/2) 154±2 nsec and (2P3/2) 135±2 nsec, and the 2P1/2 to 2P3/2 transfer cross section at 325±10 °K is 0.150±0.002 Å2. An analysis of the time-dependent decay versus xenon partial pressure shows that the cross section for quenching or collision induced radiation is less than 4×10−3 Å2. This demonstrates that collision induced transitions cannot be important in the formation of near red satellites on the Cs 6s–7p lines perturbed by Xe. In addition, the radiative decay constant for the satellite is identical to that for the line within experimental uncertainty. The correspondence of satellite and line decay curves provides a method of identifying satellites with their parent line.
The collision-induced absorption and emission coefficients for electric-dipole forbidden atomic transitions are calculated for weak radiation fields. The approximations used are valid for $\ensuremath{\hbar}\ensuremath{\omega}$ near $\ensuremath{\hbar}{\ensuremath{\omega}}_{0}$, the atomic energy differences. The example case of $S\ensuremath{-}D$ transitions induced by a spherically symmetric perturber (e.g., a noble-gas atom) is treated in detail and compared to measurements. The case of "radiative collisions," in which both colliding atoms change their state, is included in the theory and is also compared to experiment.