Collisional relaxation of highly vibrationally excited CF2O prepared with different initial energies and distribution functions

G. A. PINO; C. A. RINALDI; E. A. CORONADO; J. C. FERRERO

JOURNAL OF CHEMICAL PHYSICS

AMER INST PHYSICS

Año: 1999 vol. 110 p. 1942 - 1948

0021-9606

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 cm21, 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, ^^DE&&, is equal to the microscopic value ^DE&. However, a single exponential energy decay is not sufficient condition to assure that equality.2O* 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 cm21, 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, ^^DE&&, is equal to the microscopic value ^DE&. However, a single exponential energy decay is not sufficient condition to assure that equality.2O* 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 cm21, 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, ^^DE&&, is equal to the microscopic value ^DE&. However, a single exponential energy decay is not sufficient condition to assure that equality.3 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 cm21, 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, ^^DE&&, is equal to the microscopic value ^DE&. However, a single exponential energy decay is not sufficient condition to assure that equality.^E&. Thus, IR laser excitation results in a bimodal distribution, with average excitation energies in the range 3 000–20 000 cm21, 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, ^^DE&&, is equal to the microscopic value ^DE&. However, a single exponential energy decay is not sufficient condition to assure that equality.21, 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, ^^DE&&, is equal to the microscopic value ^DE&. However, a single exponential energy decay is not sufficient condition to assure that equality.~Ar, N2, NO2, and CF2O). It is shown that under these conditions, the observed bulk average energy transferred per collision, ^^DE&&, is equal to the microscopic value ^DE&. However, a single exponential energy decay is not sufficient condition to assure that equality.^^DE&&, is equal to the microscopic value ^DE&. However, a single exponential energy decay is not sufficient condition to assure that equality.^DE&. However, a single exponential energy decay is not sufficient condition to assure that equality.