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Variations in the strength of the infrared forbidden 2328.2 cm-1 fundamental of solid N2 in binary mixturesWe present the 2335-2325 cm-1 infrared spectra and band positions, profiles and strengths (A values) of solid nitrogen and binary mixtures of N2 with other molecules at 12 K. The data demonstrate that the strength of the infrared forbidden N2 fundamental near 2328 cm-1 is moderately enhanced in the presence of NH3, strongly enhanced in the presence of H2O and very strongly enhanced (by over a factor of 1000) in the presence of CO2, but is not significantly affected by CO, CH4, or O2. The mechanisms for the enhancements in N2-NH3 and N2-H2O mixtures are fundamentally different from those proposed for N2-CO2 mixtures. In the first case, interactions involving hydrogen-bonding are likely the cause. In the latter, a resonant exchange between the N2 stretching fundamental and the 18O = 12C asymmetric stretch of 18O12C16O is indicated. The implications of these results for several astrophysical issues are briefly discussed.
Document ID
20040088813
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bernstein, M. P.
(NASA Ames Research Center Moffett Field CA United States)
Sandford, S. A.
Allamandola, L. J.
Date Acquired
August 21, 2013
Publication Date
October 1, 1999
Publication Information
Publication: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
Volume: 55
Issue: 12
ISSN: 1386-1425
Subject Category
Exobiology
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Exobiology
NASA Center ARC

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