Differentiation of the Contribution of Velocity-Changing Gas-Particle Collisions to Attenuation of the Stimulated Photon Echo Response

© 2019, Springer Science+Business Media, LLC, part of Springer Nature. The effect of velocity-changing gas-particle collisions on the intensity of the stimulated photon echo response is investigated. The intensity is influenced most by such collisions if the exciting-pulse wave vectors are nonparallel. An approximation of the intensity of the stimulated photon echo response as a function of the time interval between the second and third exciting laser pulses is proposed and enables differentiation of the contribution of velocity-changing particle collisions to attenuation of the response. The results are of interest for optical coherent echo spectroscopy