VIBRATIONAL ENERGY TRANSFERS IN OZONE EXCITED IN THE (101) VIBRATIONAL STATE DOUBLE RESONANCE MEASUREMENTS AND SEMI-CLASSICAL CALCULATIONS IN THE TEMPERATURERANGE 200-300 K
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Date
1995
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Publisher
Ohio State University
Abstract
The vibrational energy transfer processes involved in the relaxation of $O_{3}$ molecules from the excited states of the triad {(200), (101), (102)} have been investigated by double resonance measurements in $O_{3}-O_{2}/N_{2}$ gas mixtures, in the temperature range 200-300K. It is shown that, as long as the $O_{3}$ molar fraction is higher than a few percent, the major processes are near-resonnant V-V transfers occuring upon $O_{3}-O_{3}$ collisions. The rate coefficients of these transfer processes, deduced from the measurements, have been compared to values calculated by means of a semi-classical model using equivalent straight trajectories and a multipolar intermolecular potential. The experimental temperature dependences of the transfer rate coefficients are well reproduced by the calculations. Also, from measurements performed with small $O_{3}$ molar fractions, the processes occuring upon $O_{3}-O_{2}/N_{2}$ collisions have been investigated. We have observed that the vibrational energy located in the stretching modes relaxes essentially through far-from-resonance transfers to the $v_{2}$ mode.
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Author Institution: Université P. et M. Curie, 75252 Paris Cedex 05, France.