Absolute line strengths of phosphine gas near 5 μm

Abstract

Absolute line strengths and line positions for over 200 vibration-rotation transitions of PH 3 gas were measured at 295 K, using a tunable-diode laser spectrometer. The spectral range covered was from 2153.697 to 2210.566 cm −1 . Line strength measurements were reproducible to better than 5% on average, and the uncertainty in line positions was less than 0.002 cm −1 . Certain of the PH 3 lines were pressure-broadened with H 2 gas, and the pressure-broadening coefficients were determined.