Laser Spatial Saturation Spectroscopy: A New Tool For The Study Of Diffusion Process And Interaction Potential

Chung-Yung Robert Wu; David A. Dows

doi:10.1117/12.954889

30 December 1976 Laser Spatial Saturation Spectroscopy: A New Tool For The Study Of Diffusion Process And Interaction Potential

Chung-Yung Robert Wu, David A. Dows

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Proceedings Volume 0082, Unconventional Spectroscopy; (1976) https://doi.org/10.1117/12.954889
Event: 20th Annual Technical Symposium, 1976, San Diego, United States

Abstract

A new technique for measuring diffusion coefficient and dynamic friction coefficient in gas sample at low pressure is described. By varying the distance between two spatially separate antiparallel laser beams in a saturable absorber, we are able to follow the dynamics of the Bennett hole and the resonant spike, caused by the non-linear absorption, in the molecular velocity distribution. Systems such as pure I2, I2 in the presence of argon buffer gas, and B02 radicals are studied. The present technique is also capable of measuring the diffusion coefficient of an excited state species. Because of insufficient information on the van der Waals coefficients the question to the nature of the interaction potential for I2 and non-polar quenchers remains to be answered. Finally, further application of technique echnique in the Infrared region is discussed.

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Chung-Yung Robert Wu and David A. Dows "Laser Spatial Saturation Spectroscopy: A New Tool For The Study Of Diffusion Process And Interaction Potential", Proc. SPIE 0082, Unconventional Spectroscopy, (30 December 1976); https://doi.org/10.1117/12.954889

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