Low-temperature high-resolution absorption spectrum of (NH3)-N-14 in the nu(1) + nu(3) band region (1.51 mu m)

T Foldes, D Golebiowski, M Herman, TP Softley, G Di Lonardo, L Fusina

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    Abstract

    Jet-cooled spectra of 14NH3 and 15NH3 in natural abundance were recorded using cavity ring-down (CRDS, 6584–6670 cm−1) and cavity enhanced absorption (CEAS, 6530–6700 cm−1) spectroscopy. Line broadening effects in the CRDS spectrum allowed lines with J″-values between 0 and 3 to be identified. Intensity ratios in 14NH3 between the jet-cooled CRDS and literature room-temperature data from Sung et al. (J. Quant. Spectrosc. Radiat. Transfer, 113 (2012), 1066) further assisted the line assignments. Ground state combination differences were extensively used to support the assignments, providing reliable values for J, K and inversion symmetry of the ground state vibrational levels. CEAS data helped in this respect for the lowest J lines, some of which are saturated in the CRDS spectrum. Further information on a/s doublets arose from the observed spectral structures. Thirty-two transitions of 14NH3 were assigned in this way and a limited but significant number (19) of changes in the assignments results, compared to Sung et al. or to Cacciani et al. (J. Quant. Spectrosc. Radiat. Transfer, 113 (2012), 1084). Sixteen known and 25 new low-J transitions were identified for 15NH3 in the CRDS spectrum but the much scarcer literature information did not allow for any more refined assignment. The present line position measurements improve on literature values published for 15NH3 and on some line positions for 14NH3.
    Original languageEnglish
    Pages (from-to)2407-2418
    Number of pages12
    JournalMolecular Physics
    Volume112
    Issue number18
    DOIs
    Publication statusPublished - 2014
    Event23rd Colloquium on High-Resolution Molecular Spectroscopy HRMS Budapest 2013 - Budapest, Hungary
    Duration: 25 Aug 201330 Aug 2013

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