Abstract
A tunable infrared diode laser has been used to monitor the time-resolved absorption of ro-vibrationally excited CO2 molecules produced in collisions with fast hydrogen atoms from the 193nm excimer laser photolysis of H2S. Nascent relative rotational population distributions were determined for the 0001, 0002, 0111 and 100l. The nascent distributions for the four levels were found to be significantly displaced from the 300K Boltzmann distribution with the peaks occuring at J = 33 for 0001, J=34 for 0002, J=34 for 0111 and J=35 for 1001. The absolute T-V/R excitation cross section τσ2 for 0001, J=33, was determined to be between 10−3 and 10−2 A2, and the total excitation cross-section for the entire 0001 vibrational state is in the range of 0.1 −0.4A2.
© 1988 Optical Society of America
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