Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5416099 | Journal of Molecular Spectroscopy | 2006 | 15 Pages |
Abstract
Over 8000 line positions and intensities of phosphine (PH3) at 3 μm have been measured at 0.0115 cmâ1 resolution with the McMath-Pierce Fourier Transform spectrometer at Kitt Peak. The observed line intensities ranged from 4.13 Ã 10â6 to 4.69 Ã 10â2 cmâ2 atmâ1 at 296 K, for line positions between 2724.477 and 3601.652 cmâ1. This region spans eight interacting vibrational states: 3ν2 (2940.8 cmâ1), 2ν2 + ν4 (3085.6 cmâ1), ν2 + 2ν4 (3214.9 cmâ1), ν1 + ν2 (3307.6 cmâ1), ν2 + ν3 (3310.5 cmâ1), 3ν4 (â¼3345 cmâ1), ν1 + ν4 (3426.9 cmâ1), and ν3 + ν4 (3432.9 cmâ1). Assignments have been determined for all the bands except 3ν4 (a weak band in a highly congested area) for a total of 4232 transitions. The total integrated intensity for this region is 5.70 cmâ2 atmâ1 near 296 K, and assigned lines account for 79% of the observed absorption. The two strongest bands in the region are ν1 + ν4 and ν3 + ν4 with band strengths at 296 K of 1.61 and 2.01 cmâ2 atmâ1, respectively. An empirical database of PH3 line parameters (positions, intensities, and assignments) is now available. Lower state energies (corresponding to assignments from this study) and line widths from the literature are included; default values are used for unassigned features.
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Authors
R.A.H. Butler, L. Sagui, I. Kleiner, L.R. Brown,