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Spontaneous Raman scattering has been used to measure the effective vibrational temperature of the v=1 level as a function of input power in a self-sustaining low pressure dc glow discharge in pure H2 and D2 gases. A nonmonotonic dependence of vibrational temperature on input specific power, yielding Tv=1440–1960 °K in H2, has been measured downstream of the discharge. Results of numerical calculations modeling the discharge/afterglow are presented. The agreement between theory and experiment is good and suggest that the behavior observed is caused by the effect of the temperature dependent vibrational–translation energy transfer rate.

The coherent anti-Stokes Raman spectroscopy spectrum of H2O has been measured in a heated optical cell and in laboratory flames. Comparisons of the experimental spectra with a theoretical model have been used to infer information about the unknown Raman linewidths of H2O. In the test cell, excellent agreement has been obtained between theory and experiment in terms of physically realistic linewidths. Agreement between experiment and theory in laboratory flames is also good.

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Application of thermal dissociation of O 2 , developed within arc-heated gas mixtures, followed by a sufficiently rapid convection to preserve 0 atom concentrations and subsequent C~ injection, has generated efficiently a CO laser medium. In preliminary experiments, this pumping technique has produced a 34-W cw laser emitting over a band of vibration-rotation transitions from 4.9 to 5.71.1 from a 5-cm active transverse optical cavity.