ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The collisional relaxation of highly vibrationally excited CF2O* molecules prepared by infrared laser multiphoton absorption is compared with the results obtained when CF2O* is generated as a product of the reactions of CF3 and CF2Cl radicals with NO2. The three methods produce molecules with probably different energy distributions and also different average excitation energies 〈E〉. Thus, IR laser excitation results in a bimodal distribution, with average excitation energies in the range 3 000–20 000 cm−1, while the chemical reactions of CF3 and CF2Cl radicals produce CF2O* with a undetermined level of vibrational excitation that depends on the specific energy change of the process. Irrespective of the method of preparation, the same exponential decays are obtained for the each of various colliders studied (Ar, N2, NO2, and CF2O). It is shown that under these conditions, the observed bulk average energy transferred per collision, 〈〈ΔE〉〉, is equal to the microscopic value 〈ΔE〉. However, a single exponential energy decay is not sufficient condition to assure that equality. © 1999 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.477861
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