Time-resolved UV-IR pump-stimulated emission pump spectroscopy to probe collisional relaxation of $8p\,^2P_{3/2}$ Cs I

TL;DR

This paper introduces a time-resolved spectroscopic method to measure collisional relaxation in excited cesium atoms, providing new quantitative data on atom-gas interactions relevant for atomic physics.

Contribution

The study develops and applies a novel pump-stimulated emission pump technique to measure disalignment cross sections in cesium, advancing understanding of collisional processes in high-lying atomic states.

Findings

Measured disalignment cross section for Cs 8p 2P3/2 level with argon

Demonstrated polarization dependence of fluorescence signals

Provided quantitative data on collisional relaxation rates

Abstract

We describe and use a time-resolved pump-stimulated emission pump spectroscopic technique to measure collisional relaxation in a high-lying energy level of atomic cesium. Aligned $8p\,^2P_{3/2}$ cesium atoms were produced by a pump laser. A second laser, the stimulated emission pump, promoted the population exclusively to the $5d\,^2D_{5/2}$ level. The intensity of the $5d\,^2D_{5/2}\rightarrow6s\,^2S_{1/2}$ cascade fluorescence at 852.12 nm was monitored. The linear polarization dependence of the $6s\,^2S_{1/2}\rightarrow8p\,^2P_{3/2}\rightarrow5d\,^2S_{5/2}$ transition was measured in the presence of argon gas at various pressures. From the measurement, we obtained the disalignment cross section value for the $8p\,^2P_{3/2}$ level due to collisions with ground-level argon atoms.