Fourier transform infrared spectra of the 2.nu.2 and .nu.2 + .nu.4 bands of phosphine

The lowest-lying overtone (2nu/sub 2/) and combination (nu/sub 2/ + nu/sub 4/) bands of phosphine have been investigated for the first time with a Fourier transform spectrometer with 0.01-cm/sup -1/ resolution. A least-squares fit which includes Coriolis coupling parameters has been performed on both bands simultaneously. The resulting constants fit 400 transitions with a standard deviation of 0.05 cm/sup -1/. Rotational parameters for the excited states and vibrational frequencies are obtained from the analysis. 17 references, 3 tables.