High-temperature spectrum of H2O in the 720-1400 cm-1 region.

Details High-temperature spectrum of H2O in the 720-1400 cm-1 region. High-temperature spectrum of H2O in the 720-1400 cm-1 region.

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jqsrt..60..711e&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 60, issue 5, pp. 711-739

Computer Science

4

Water Vapor: Infrared Spectra, Water Vapor: Laboratory Spectra

Scientific paper

Spectral line positions and line position uncertainties have been determined for 1605 absorption lines of H2O in the spectral region from 720 to 1400 cm-1. Of these, transition identifications were confirmed for 921 of the spectral lines. The line-position measurements were obtained from a transmittance spectrum having a signal-to-noise ratio greater than 100 to 1. The apodized spectral resolution was 0.009 cm-1. The 20 Torr H2O sample was heated to approximately 1000 K, in a 1.75 m single pass sample cell. The wavelength scale of the transmittance spectrum was calibrated by using strong well-known H2O spectral lines. The line-position estimates and identifications were checked using a modified Loomis-Wood diagram technique. Initial guess line-position estimates were obtained from either HITRAN92 or a direct numerical diagonalization (DND) calculation of the H2O Hamiltonian. The transition identifications were confirmed and a consistent set of line-position values determined using a combination - difference technique to check closed loops on an energy level diagram. A few large (>0.1 cm-1), and many smaller (from 0.1 to 0.001 cm-1), line position differences were found when the measured line positions were compared to the values on HITRAN92. These differences are all larger than the line-position measurement uncertainties, which are generally less than 0.001 cm-1. Many of the new and confirmed H2O line-position measurements have been incorporated into HITRAN96.

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