Near resonant vibration. -->. vibration energy transfer under single collision conditions
Collisional energy transfer from energy levels > or =1900 cm/sup -1/, produced by IR multiphoton absorption, C/sub 3/H/sub 2/O(v>1)+M..-->..C/sub 3/H/sub 2/O(v=1)+M/sup /, is observed on a single collision basis by monitoring changes in the vibrational level populations of propynal as reflected in the laser excitation spectrum. It is concluded that vibration ..-->.. vibration processes account for these observations and occur only with collision partners for which near resonant pathways exist. Under even the most favorable conditions (..delta..E=40 cm/sup -1/), neither vibration ..-->.. translation pathways nor multiple quantum changes involving nondriven modes are observed when ..nu../sub 6/ is the pumped mode. Observations suggest that multiple quantum events involving the pumped mode occur, but comparison of rate constants from different levels is hindered at present by the identification of overtones in the visible spectroscopy.
- Research Organization:
- Brookhaven National Laboratory, Department of Chemistry, Upton, New York 11973
- OSTI ID:
- 6745662
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 74:1; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Vibration. -->. vibration energy transfer in methane
Photoacoustic spectroscopy of vibrational overtones in gas-phase CH/sub 3/OH and CH/sub 3/OD