VIBRATIONAL RELAXATION OF D2O ( v2)
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, PD{sub 2}O-HDO and PD{sub 2}O-H{sub 2}O were estimated to be not very different from PD{sub 2}O-D{sub 2}O. 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 {epsilon} = (778 {+-} 34) K and C = 1.1 x 10{sup -2}.
- Research Organization:
- Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
- Sponsoring Organization:
- Materials Sciences Division
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1030596
- Report Number(s):
- LBL-10473
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 1 Vol. 73; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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