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

Jet-cooled spectra of super(14)NH sub(3) and super(15)NH sub(3) in natural abundance were recorded using cavity ring-down (CRDS, 6584-6670 cm super(-1)) and cavity enhanced absorption (CEAS, 6530-6700 cm super(-1)) spectroscopy. Line broadening effects in the CRDS spectrum allowed lines with J super...

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Bibliographic Details
Published in:Molecular physics 2014-09, Vol.112 (18), p.2407-2418
Main Authors: Foldes, T, Golebiowski, D, Herman, M, Softley, T P, Di Lonardo, G, Fusina, L
Format: Article
Language:English
Subjects:
Band spectra
Ground state
Holes
Line broadening
Molecular physics
Position measurement
Spectra
Symmetry
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Summary:Jet-cooled spectra of super(14)NH sub(3) and super(15)NH sub(3) in natural abundance were recorded using cavity ring-down (CRDS, 6584-6670 cm super(-1)) and cavity enhanced absorption (CEAS, 6530-6700 cm super(-1)) spectroscopy. Line broadening effects in the CRDS spectrum allowed lines with J super( double prime )-values between 0 and 3 to be identified. Intensity ratios in super(14)NH sub(3) 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 super(14)NH sub(3) 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 super(15)NH sub(3) 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 super(15)NH sub(3) and on some line positions for super(14)NH sub(3).
ISSN:0026-8976
1362-3028
DOI:10.1080/00268976.2014.904944