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We report the first direct measurement of the vibration-to-vibration (V-V) and vibration-to-translation (V-T) rates for vibrational relaxation out of the =2 vibrational level in hydrogen gas. Time domain photoacoustic spectroscopy was used to monitor the collision dynamics after excitation into =2 through overtone stimulated Raman pumping. The V-V relaxation rate is found to be (1-4) 10-14 cm3 s-1 molecule-1 and the V-T rate constant is (0.6-2) 10-15 cm3 s-1 molecule-1 for normal hydrogen at 298 K. 1988.
author list (cited authors)
Kreutz, T. G., Gelfand, J., Miles, R. B., & Rabitz, H.