Infrared spectroscopy of radioactive hydrogen chloride H36Cl

Santeri Larnimaa (Corresponding Author), Markku Vainio, Ville Ulvila

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2 Citations (Scopus)


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.

Original languageEnglish
Article number107984
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Publication statusPublished - Jan 2022
MoE publication typeA1 Journal article-refereed


This work obtained funding from the Euratom research and training programme 2014–2018 [Grant agreement No. 755371, the CHANCE project]; the Academy of Finland [Project No. 326444]; and the Flagship on Photonics Research and Innovation of the Academy of Finland (PREIN). S. Larnimaa acknowledges financial support from the CHEMS doctoral program of the University of Helsinki.


  • Fourier-transform infrared spectroscopy FTIR
  • Line center wavenumber
  • Molecular constant
  • Radioactive hydrogen chloride HCl
  • Rotational-vibrational spectroscopy


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