Line Positions and Intensities in the Vibrational System / /2 of NH near 3 Microns
I. Kleiner (Laboratoire de Photophysique Moleculaire), G. Tarrago, G. Guelachvili, Q-L. Kou, N. Picqué (Laboratoire de Physique Moleculaire et A), L. R. Brown (JPL)
To characterize the ammonia spectrum between 3100 and 3700 cm-1, we have
analyzed experimental line positions and intensities of the ,
and 2 bands of NH obtained from 0.011 cm-1
unapodized resolution spectra recorded with the Fourier transform
spectrometer at Kitt Peak National Observatory.
About 2110 lines with J' up to 10 have been assigned from which 1835
positions are fitted using an effective rotation-inversion Hamiltonian
to achieve a rms of 0.085 cm-1. 531 intensity measurements are modelled
to 8 terms in the dipole moment expansion to 8.9%. The band strenghts
(determined for the first time in the case of the 2 band will
be shown. A prediction of the line positions and intensities has been
generated for all lines with intensities greater than 0.1 10-6 cm-2 atm-1
at 296 K suitable for planetological purposes. The theoretical model and the
set of programs developped for treating the infrared spectra of
ammonia will be briefly described.
Part of the research described in this paper was carried out by the
Jet Propulsion Laboratory, California Institute of Technology, under
contract with the National Aeronautics and Space Administration.