The absorption spectrum of phosphine (PH3) between 2.8 and 3.7 mu m: Line positions, intensities, and assignments

摘要

Over 8000 line positions and intensities of phosphine (PH3) at 3 mu m have been measured at 0.0115 cm(-1) resolution with the McMath-Pierce Fourier Transform spectrometer at Kitt Peak. The observed line intensities ranged from 4.13 x 10(-6) to 4.69 x 10(-2) cm(-2) atm(-1) at 296 K, for line positions between 2724.477 and 3601.652 cm(-1). This region spans eight interacting vibrational states: 3v(2) (2940.8 cm(-1)), 2v(2) + v(4) (3085.6 cm(-1)), v(2) + 2v(4) (3214.9 cm(-1)), v(1) + v(2) (3307.6 cm(-1)), v(2) + v(3) (3310.5 cm(-1)), 3v(4) (similar to 3345 cm(-1)), v(1) + v(4) (3426.9 cm(-1)), and v(3) + v(4) (3432.9 cm(-1)). Assignments have been determined for all the bands except 3v(4) (a weak band in a highly congested area) for a total of 4232 transitions. The total integrated intensity for this region is 5.70 cm(-2) atm(-1) near 296 K, and assigned lines account for 79% of the observed absorption. The two strongest bands in the region are v(1) + v(4) and v(3) + v(4) with band strengths at 296 K of 1.61 and 2.01 cm(-2) atm(-1), 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. (c) 2006 Elsevier Inc. All rights reserved.