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Physical Review Letters

Laser Triple-Quantum Photoionization of Cesium

R. A. Fox, R. M. Kogan, Edward J. Robinson

Published Jun 7, 1971• 89 citations
Publisher

Abstract

We report observations of the ionization of atomic cesium by the simultaneous absorption of three ruby-laser quanta. Our results appear to be in qualitative agreement with theory, and indicate that circularly polarized ruby light produces ionization about twice as efficiently as does linearly polarized light.
DOI
10.1103/physrevlett.26.1416

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This paper will review briefly a recent experiment which measured the photodetachment probability for I-ions due to simultaneous absorption of two ruby quanta. We have calculated the two-quantum photoionization rate for atomic cesium as a function of wavelength. The "transition" from the initial state to the bound intermediate state is expressed in terms of oscillator strengths. The second "transition," from these excited valence states into the coulomb continuum is expressed as a cross section. We have observed what appear to be genuine two-photon ionization signals in three cases: 1) near resonance in the10P_{3/2}state using the second-harmonic ofQ-switched ruby, 2) away from resonances, using the 5300 Å second-harmonic ofQ-switched neodymium laser, and 3) away from resonances using the first anti-Stokes line at 5750 Å from ruby-pumped D2gas. Present experiments aim at scanning the interesting range near resonance, e.g., by thermally tuning the ruby.
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