Since the IR multiple-photon decomposition probability of polyatomic molecules is a function of radiative fluence, the measured fraction of the dissociated molecules could be affected by the spatial distribution of radiation. In this paper the influence of the radiative distribution of a Gaussian beam on measured probability is investigated in detail. The main conclusions are that, for two special cases, namely, cylindrical beam and double-cone beam, one will be able to get information of the fluence dependence of real decomposition probability from measured energy dependence of average probability by means of a log-log plot. This article will be helpful for consideration of experimental conditions, summarizing of data, and comparison of the results of different experiments to avoid possible confusion.
© 1983 Optical Society of America
Xing-Xiao Ma, Guo-Ying Xu, P. Galarneau, and S. L. Chin, "Spatial effect in a multiple IR photon decomposition experiment using a Gaussian laser beam," Appl. Opt. 22, 2007-2012 (1983)