High temperature performance of the HITEMP2010 and HITRAN Online databases: comparison with frequency comb measurements of water vapor absorption from 6800 cm-1 to 7200 cm-1
Paul J. Schroeder, D Pfotenhauer, J Yang, William C. Swann, Ian R. Coddington, Nathan R. Newbury, Greg B. Rieker
The HITEMP2010 and HITRAN Online databases are important tools for predicting molecular absorption under various environmental conditions. At room temperature the databases can be quite accurate, owing to their development using room temperature absorption data. However, at elevated temperatures common to combustion and planetary research, their broadband accuracy is largely unexplored. We utilize a dual frequency comb spectrometer and a high temperature optical cell to assess the performance of these databases for water vapor absorption at up to 1300 K in the 6800-7200 cm-1 frequency range. At these high temperatures, HITRAN Online is shown to be a more accurate predictor of high temperature air-broadened water vapor spectra than HITEMP2010, for absorption features with linestrength greater than 1e-23 (cm-1/molecule cm-2). The analysis shows that simple temperature scaling relationships for pressure shifts and self-broadened half widths increase the predictive capability of both databases and should be employed whenever transition-specific information is unavailable.
Journal of Quantitative Spectroscopy and Radiative Transfer
, Pfotenhauer, D.
, Yang, J.
, Swann, W.
, Coddington, I.
, Newbury, N.
and Rieker, G.
High temperature performance of the HITEMP2010 and HITRAN Online databases: comparison with frequency comb measurements of water vapor absorption from 6800 cm-1 to 7200 cm-1, Journal of Quantitative Spectroscopy and Radiative Transfer, [online], https://doi.org/10.1103/PhysRevApplied.9.044002
(Accessed December 9, 2023)