OVERTONE STIMULATED RAMAN PUMPING OF $H_{2}$ FROM V = 0 TO V = 2 AND SUBSEQUENT TIME DOMAIN PHOTOACOUSTIC DETECTION OF VIBRATIONAL RELAXATION
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Date
1985
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Ohio State University
Abstract
We report preliminary data showing the first stimulated Raman overtone pumping of a molecule. Using this method we have excited $H_{2}$ into the V = 2 vibrational state, followed by time domain photoacoustic detection of the vibrational relaxation. The stimulated Raman pumping is generated with the 1.06$\mu$ output of a Nd:YAG laser in combination with 572 nm radiation from a tunable dye laser. The difference in energy of these two is equal to the V = 0 to V = 2 transition in $H_{2}$. The laser beams are combined and focused through a 10 cm photoacoustic cell. Subsequent analysis of this data will allow a direct determination of vibration-vibration (V-V) and vibration-translation (V-T) relaxation rates from V = 2 to V = 1 in hydrogen.
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Author Institution: Department of Mechanical and Aerospace Engineering, Princeton University; Department of Mechan\'{i}cal and Aerospace Engineering, Princeton University; Department of Chemistry, Princeton University