Vibrational relaxation of D/sub 2/O (. nu. /sub 2/)
The method of laser-excited vibrational fluorescence has been used to measure vibrational relaxation rates for the bending mode of D/sub 2/O in collisions with D/sub 2/O, D/sub 2/, HD, H/sub 2/, He, and Ar. The rate constants at 295 K are found to be (3.2 +- 0.2) x 10/sup -11/, (3.6 +- 0.2) x 10/sup -13/, (1.2 +- 0.1) x 10/sup -12/, (3.3 +- 0.2) x 10/sup -12/, (7.1 +- 0.9) x 10/sup -14/, and (3.0 +- 1.2) x 10/sup -14/ cm/sup 3/ molecule/sup -1/ sec/sup -1/, respectively. Relaxation times have been measured for two D/sub 2/O--HDO--H/sub 2/O mixtures and relaxation probabilities, P/sub D2Oen-dashHDO/ and P/sub D2Oen-dashH2O/ were estimated to be not very different from P/sub D2Oen-dashD2O/. The temperature dependence of the relaxation was measured for pure D/sub 2/O. The rates are (1.80 +- 0.08) x 10/sup -11/ at 400, (2.1 +- 0.1) x 10/sup -11/ at 350 and (4.0 +- 0.3) x 10/sup -11/ cm/sup 3/ molecule/sup -1/ sec/sup -1/ at 260 K. The corresponding probabilities are fit by P(T)=C exp(epsilon/kT) with epsilon788=(plus-or-minus34) K and C=1.1 x 10/sup -2/.
- Research Organization:
- Department of Chemistry, University of California, Berkeley California 94720
- OSTI ID:
- 5258402
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 73:1; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
COLLISIONS
CRYOGENIC FLUIDS
DEUTERIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUIDS
HEAVY WATER
HELIUM
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
HYDROGEN ISOTOPES
ISOTOPES
KINETICS
LIGHT NUCLEI
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
RARE GASES
RELAXATION
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
VIBRATIONAL STATES
WATER