BROADENING OF H{sub 2}O ROTATIONAL LINES BY COLLISIONS WITH He ATOMS AT LOW TEMPERATURE
- Instituto de Física Fundamental CSIC, Serrano 123, E-28006 Madrid (Spain)
We report pressure broadening (PB) coefficients for the 21 electric–dipole transitions between the eight lowest rotational levels of ortho-H{sub 2}O and para-H{sub 2}O molecules by collisions with He at temperatures from 20 to 120 K. These coefficients are derived from recently published experimental state-to-state rate coefficients for H{sub 2}O:He inelastic collisions, plus an elastic contribution from close coupling calculations. The resulting coefficients are compared to the available experimental data. Mostly due to the elastic contribution, the PB-coefficients differ much from line to line, and increase markedly at low temperature. The present results are meant as a guide for future experiments and astrophysical observations.
- OSTI ID:
- 22525676
- Journal Information:
- Astrophysical Journal, Vol. 808, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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