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Title:
Calculated refractivity of water vapor and moist air in the atmospheric window at 10 μm
Authors:
Mathar, Richard J.
Affiliation:
AA(Max-Planck-Institute for Astronomy, Konigstuhl 17, 69117 Heidelberg, Germany)
Publication:
Applied Optics, Volume 43, Issue 4, pp. 928-932 (2004).
Publication Date:
02/2004
Origin:
STI
Keywords:
infrared spectroscopy, infrared astronomy, astronomical telescopes, atmospheric light propagation, humidity measurement, atmospheric humidity, spectral analysis
DOI:
10.1364/AO.43.000928
Bibliographic Code:
2004ApOpt..43..928M

Abstract

The HITRAN 2000 database of infrared line transitions has been used to calculate the dispersion coefficient of water vapor at room temperature in the atmospheric window up to 25 μm, confirming an equivalent earlier compilation [Infrared Phys. 26, 371 (1986)]. I complement this line set by using an previously published ultraviolet pseudospectrum [J. Chem. Phys. 68, 1426 (1978)] to improve coverage of the near infrared. The effect of admixtures of abundant nitrogen, oxygen, and carbon dioxide is predicted on the same calculational basis to synthesize the air representative of the mountain that hosts the Very Large Telescope Interferometer and is found to be small compared with the dominant role of water at wavelengths above 3 μm.
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Database: Astronomy
Physics
arXiv e-prints