$H_{2}O$ LINE POSITION MEASUREMENTS AT 1000K
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Date
1994
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Ohio State University
Abstract
A 20 torr $H_{2}O$ sample has been heated to 1000K in a 1.75 m stainless steel absorption cell the spectrum measured with a Michelson interferometer using a maximum optical path difference of 114 cm resulting in an apodized resolution of $0.009 cm^{-1}$. More than 1200 lines were identified in the 1000 to $1400 cm^{-1}$ spectral region. A Loomis-Wood diagram technique proved extremely useful in making the line assignments. After a number of lines had been identified, knowledge of the energy levels derived from these identified lines was used to identity additional lines in a boot-strapping process. When the observed line positions were compared to the line positions on the HITRAN 92 data $base^{1}$, discrepancies of up to $0.8 cm^{-1}$ were found. An important source of self-consistent spectral line data used with the Loomis-Wood diagram technique was obtained from a DND (direct numerical diagonalization) $calculation^{2}$. These line positions were calculated using a 47-Parameter potential surface with up to hextic powers in internal coordinates and generated with a consistent nonlinear least-squares fit. The results of analysis and comparisons with other researchers will be presented at the symposium.
Description
This work was supported by the Air Force Office of Scientific Research (AFOSR) as part of PL/GL-Task 2310G1. 1. L.S. Rothman et al. {JQSRT} \textbf{48}, 469 (1992). 2. R.B. Wattson and L.S. Rothman {JQSRT} \textbf{48}, 763 (1992).
Author Institution: Stewart Radiance Laboratory, Utah State University; Geophysics Directorate, Phillips Laboratory/GPOS
Author Institution: Stewart Radiance Laboratory, Utah State University; Geophysics Directorate, Phillips Laboratory/GPOS