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Springer eBooks

General Theory for Collisional Effects in Quantum Beat Spectroscopy

R. M. Herman, Kelly Meyer

Published Jan 1, 1978• 1 citation
Publisher
DOI
10.1007/978-1-4757-0665-9_76

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Considers the transfer of optical coherence from one level pair to another. The effect is isolated from the general collision expression derived by Berman (1976) and it is argued that it is best observed in transient measurements. The free decay of a four-level system is solved analytically and two regimes are found: one with oscillations displaying a beat and another with two decay rates. At the border the exponential dependence is modified. The implications for free induction decay and echo experiments are presented. Both phenomena can be used to detect the collisional transfer of coherence, and some experimental aspects of their observation are discussed.
Polarization nondegenerate nonstationary coherent anti-Stokes Raman spectroscopy was used in measurements of pulse responses for separate electronic multipole moments. The 6P(1/2)-6P(3/2) transition of Tl atoms was investigated. Doppler dephasing conditions, quantum beats of the hyperfine components of this transition are clearly seen when pure anisotropic scattering is registered, but they are small in the case of purely antisymmetric scattering. Under collisional dephasing conditions the relaxation rates of anisotropic and antisymmetric scattering agree with existing theory within +/-5%.