The nu(2)/nu(4) diad of PH3

The nu(2)/nu(4) diad of phosphine has been investigated between 920 and 1080 cm(-1) by laser sideband spectroscopy. Using 62 observed lines and more than 250 transitions measured by other authors, including microwave, far infrared, and laser Stark observations, a fit was performed, which achieved a standard deviation of 1.2 MHz. A(1)/A(2) splitting due to vibrational rotational interaction could be resolved in ten transitions. (C) 1997 Academic Press, Inc.