Infrared spectroscopy of radioactive hydrogen chloride H36Cl

• Published in: Journal of quantitative spectroscopy & radiative transfer Vol. 277; p. 107984
• Main Authors: Larnimaa, Santeri, Vainio, Markku, Ulvila, Ville
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-01-2022
• Subjects: Fourier-transform infrared spectroscopy FTIR; Line center wavenumber; Molecular constant; Radioactive hydrogen chloride H36Cl; Rotational-vibrational spectroscopy; Line center wavenumber; Molecular constant; Radioactive hydrogen chloride H36Cl; Fourier-transform infrared spectroscopy FTIR; Rotational-vibrational spectroscopy
• ISSN: 0022-4073; 1879-1352
• DOI: 10.1016/j.jqsrt.2021.107984

•This is the first report of optical absorption measurements of H36Cl.•The fundamental and first overtone rovibrational bands have been characterized.•The line center wavenumbers agree well with the theoretical isotope shifts.•The linewidths and relative intensities were compared to those of H35Cl and H37Cl.•The molecular constants of the lower and upper states have been determined.
We present the first report of optical absorption spectroscopy of H36Cl, a radioactive isotopologue of hydrogen chloride. We used Fourier-transform infrared spectroscopy to determine the line center wavenumbers of the fundamental rovibrational band lines P(10)–R(10) and the first overtone band lines P(1)–R(7) with total uncertainty of less than 0.0018 cm−1 (60 MHz) and 0.007 cm−1 (0.2 GHz), respectively, at 68% confidence level. We also performed a rotational analysis on the bands to determine the related molecular constants. We further compared the linewidths and relative intensities of the lines to those of the stable isotopologues H35Cl and H37Cl. The new spectroscopic information assists in developing optical instrumentation for the detection of H36Cl.