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Título

Broadening of H2O rotational lines by collisions with He atoms at low temperature

AutorHernández, Marta I. ; Fernández Sánchez, José María ; Tejeda, Guzmán ; Moreno, Elena ; Montero, Salvador
Palabras claveAstronomical databases: miscellaneous
ISM: lines and bands
ISM: molecules
Methods: laboratory: molecular
Molecular data
Submillimeter: general
Fecha de publicación30-jul-2015
EditorAmerican Astronomical Society
CitaciónAstrophysical Journal, 808:175-781 (2015)
ResumenWe report pressure broadening (PB) coefficients for the 21 electric–dipole transitions between the eight lowest rotational levels of ortho-H2O and para-H2O 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 H2O: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.
Descripción7 págs.; 2 figs.; 2 tabs.
Versión del editorhttp://dx.doi.org/10.1088/0004-637X/808/2/175
URIhttp://hdl.handle.net/10261/120989
DOI10.1088/0004-637X/808/2/175
ISSN0004-637X
E-ISSN1538-4357
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