Water Vapor Absorption Spectroscopy and Validation Tests of Databases in the Far-Infrared (50–720 Cm−1). Part 2: H217O and HD17O

E. V. Karlovets,S. N. Mikhailenko,A. O. Koroleva,A. Campargue

JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER（2024）

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Abstract

The present work is the second part of our systematic study of the absorption spectrum of the water vapor isotopologues by high resolution (approximate to 0.001 cm(-1)) Fourier transform spectroscopy in the far infrared (50-721 cm(-1)). The room temperature spectra were recorded at the AILES beam line of the SOLEIL synchrotron with an absorption pathlength of 151.75 m. Here, we consider three spectra of a water vapor sample highly enriched in O-17. Line parameters retrieved from the three spectra were combined in a global list of 4432 water lines (assigned to 4651 transitions). The spectral calibration based on a statistical matching with about 370 accurate reference line positions of (H2O)-O-16 allows for line center determinations with an accuracy of 5x10(-5) cm(-1) for well isolated lines of intermediate intensity. Six water isotopologues ((H2O)-O-18, (H2O)-O-16, (H2O)-O-17, (HDO)-O-18, (HDO)-O-16, and (HDO)-O-17) were found to contribute to the spectrum. 460 and 99 of the measured (H2O)-O-17 and (HDO)-O-17 transitions are newly observed by absorption spectroscopy. 69 (H2O)-O-17 and 20 (HDO)-O-17 energy values of the ground (000) and first excited (010) states are newly determined. The present set of measured (H2O)-O-17 line positions is combined with 24 literature sources to provide a list of 821 empirical energies for the first five vibrational states - (000), (010), (020), (100), and (001) - using the RITZ principle. A set of 332 rotational energies of the (000) and (010) states of (HDO)-O-17 is determined by merging the 465 (HDO)-O-17 transitions measured in the present study to eight literature sources.

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Key words

Water vapor,Far infrared,Rotational spectrum,Isotopologues

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