Infrared line parameters at low temperatures relevant to planetary atmospheres

Astronomy and Astrophysics – Astronomy

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Atmospheric Models, Infrared Radiation, Line Spectra, Low Temperature, Molecules, Planetary Atmospheres, Temperature Dependence, Hydrogen, Nitrogen, Oxygen, Planetary Temperature, Tunable Lasers

Scientific paper

Employing the techniques that were described in several publications for measuring infrared lineshifts, linewidths and line intensities with a tunable diode laser, these parameters were measures for lines in the important infrared bands of several molecules of interest to the planetary astronomer at low temperatures that are relevant to planetary atmospheres using He, Ne, Ar, H2, N2, O2, and air as the perturbers. In addition to obtaining the many original data on the temperature dependence of the intensities and linewidths, it was also the first measurement of the same for the collision-induced lineshift of an infrared line and it showed that it was markedly different from that of the corresponding collision-broadened linewidth.

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