Abstract
The V→T, R relaxation rate for NH3 (ν2) has been studied from 198 to 398 °K by the method of laser-excited vibrational fluorescence. The self-deactivation rate constant decreases from 4.9×10−11 cm3 molecule−1 sec−1 at 198 °K to 2.7×10−11 cm3 molecule−1 sec−1 at 398 °K. The rate constants for deactivation by He, Ar, N2, and O2 are much smaller and show a weak temperature dependence in the opposite direction. For H2 18O the vibrational relaxation rates of the coupled ν1, ν3 stretching level manifold and of the 2ν2 bending level have been studied from 250 to 400 °K. The ν1, ν3 self-deactivation rate goes from 3.5×10−11 cm3 molecule−1 sec−1 at 250 °K to 2.0×10−11 cm3 molecule−1 sec−1 at 400 °K. For 2ν2 it goes from 1.2×10−10 to 7.8×10−11 cm3 molecule−1 sec−1. The temperature depencence of the deactivation of both levels by He and Ar is much weaker and the rates are several hundred times slower. CO2 deactivates ν1, ν3 about 50 times faster than He or Ar at 293 °K.
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Dates
| Type | When |
|---|---|
| Created | 22 years, 6 months ago (Feb. 28, 2003, 3 p.m.) |
| Deposited | 1 year, 6 months ago (Feb. 9, 2024, 3:56 p.m.) |
| Indexed | 3 months, 3 weeks ago (May 14, 2025, 5:24 a.m.) |
| Issued | 45 years, 6 months ago (Feb. 15, 1980) |
| Published | 45 years, 6 months ago (Feb. 15, 1980) |
| Published Print | 45 years, 6 months ago (Feb. 15, 1980) |
@article{Hovis_1980, title={Temperature dependence of vibrational energy transfer in NH3 and H2 18O}, volume={72}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.439383}, DOI={10.1063/1.439383}, number={4}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Hovis, Floyd E. and Moore, C. Bradley}, year={1980}, month=feb, pages={2397–2402} }