Temperature dependence of N2-, O2-, and air-broadened half-widths of water vapor transitions: insight from theory and comparison with measurement
| Main Authors: | R. R. Gamache, , B. K. Antony , P. R. Gamache , M. Birk , G. Wagner |
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| Format: | info Proceeding Journal |
| Terbitan: |
, 2006
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/17622 |
Daftar Isi:
- Calculations of N 2 -, O 2- broadened half-widths, ?, of water vapor transitions in the 3.2 to 17.76 ?m spectral region were made at 225 and 296 K with the mean relative thermal velocity approximation of the complex Robert-Bonamy (CRB) formalism. Five thousand four hundred and forty two transitions belonging to 11 vibrational bands were studied. From these data air-broadened half-widths were determined at the two temperatures and the temperature dependence of the half-width was evaluated using the standard formula (See PDF for formula) For a limited number of transitions CRB calculations doing the velocity integral were made at 7 temperatures in the range 200-980 K. The mechanisms in the broadening process are discussed and the effects on ? and on the temperature dependence of the half-width as a function of the quantum states of the transitions are shown. Where possible this work is compared with measurement. It is shown that the standard temperature dependence model for the half-width is not correct for a number of transitions.