Abstract
Optical scattering from laser-induced thermal gratings (LITGs) was employed in investigations of molecular relaxation processes in gas mixtures containing a small amount of NO 2 diluted with different buffer gases (N 2,Ar,CO 2). The thermal gratings were generated by the thermalization of the molecular internal energy stored in the NO 2 molecules after laser resonant excitation of the 2 B 1← 2 A 1 Huber–Douglas band. The temporal evolution of LITGs was detected by scattering a cw read-out laser beam. A theoretical simulation of experimental results was performed in which the linearized hydrodynamic equations relevant to collisions responsible for the relaxation process were solved by following a two-step rate equations approach.
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