Diode laser absorption probe of vibration-vibration energy transfer in CO/sub 2/
Time domain absorption spectroscopy with a tunable diode laser has been used to measure the rate constant for vibration-to-vibration energy transfer in CO/sub 2/ via the near-resonant collision up-pumping process CO/sub 2/(00/sup 0/1) + CO/sub 2/(00/sup 0/1) in equilibrium CO/sub 2/(00/sup 0/2) + CO/sub 2/(00/sup 0/0). The diode laser, in combination with a CO/sub 2/ discharge reference cell, is used to monitor the time-dependent population increase within the CO/sub 2/(00/sup 0/2) state in a 10:1 mixture of Ar and CO/sub 2/ following pulsed excitation of the CO/sub 2/(00/sup 0/1) level by a Q-switched CO/sub 2/ laser. The intramode relaxation rate constant, k, for this process is found to be (5.6 +/- 0.7) x 10/sup 6/ s/sup -1/ Torr/sup -1/ or (1.7 +/- 0.2) x 10/sup -10/ cm/sup 3/ s/sup -1/ molecule/sup -1/ at 298 K.
- Research Organization:
- Columbia Univ., New York, NY
- DOE Contract Number:
- AC02-78ER04940
- OSTI ID:
- 5570942
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:22; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400500* -- Photochemistry
ABSORPTION SPECTROSCOPY
ARGON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON DIOXIDE LASERS
CARBON OXIDES
CHALCOGENIDES
DATA
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
GAS LASERS
GASES
INFORMATION
LASERS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RARE GASES
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SPECTROSCOPY
VIBRATIONAL STATES