Positions and intensities in the 3ν2/ν2+ν4 vibrational system of 14NH3 near 4 μm.

Details Positions and intensities in the 3ν2/ν2+ν4 vibrational system of 14NH3 near 4 μm. Positions and intensities in the 3ν2/ν2+ν4 vibrational system of 14NH3 near 4 μm.

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jmosp.173..120k&link_type=abstract

Journal of Molecular Spectroscopy, Vol. 173, No. 1, p. 120 - 145

Physics

15

Line Intensities: Spectra

Scientific paper

Reports experimental line positions and intensities of the 3ν2 and ν2+ν4 bands of 14NH3 obtained from 0.011 cm-1 unapodized resolution spectra recorded with the Fourier transform spectrometer at Kitt Peak National Observatory. A total of 1366 lines with J' ≤ 13 have been assigned from which 1213 line positions with J' ≤ 12 are fitted, using an effective rotation-inversion Hamiltonian to achieve a rms of 0.0069 cm-1; 726 intensity measurements are modeled to 12 terms of dipole moment expansion to ±6%. The band strengths of 3ν2 (s-a) at 2384.15 cm-1, of 3ν2 (a-s) at 2895.52 cm-1, of ν2+ν4 (s-s) at 2540.53 cm-1, and of ν2+ν4 (a-a) at 2586.13 cm-1 are estimated to be 0.61(3), 0.244(7), 0.186(3) and 0.174(25) cm-1atm-1, respectively, at 296K. In addition to the 3ν2/ν2+ν4 system, there are a number of strong lines that are thought to belong to hot bands. A prediction of the line positions and intensities has been generated for all lines with intensities greater than 0.1×10-6 cm-2atm-1 at 296K and submitted to the HITRAN database. Implications about the suitability of the Hamiltonian used are explored, given that the experimental accuracy is about 16 times better than has been achieved by the fit.

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