Raman spectroscopy of PH 3 and PH 2 at high temperature and simulation of PH 3 Raman spectrum

Experimental Raman spectra of the symmetric stretching vibration band v 1 and of the degenerate stretching vibration band v 3 of PH 3 were obtained for temperatures ranging from 293 to 903 K. These spectra also show a band of a new gaseous species, which is a pyrolysis product of PH 3 . This band can be unambiguously attributed to PH 2 . To extract the Raman spectrum of PH 2 from the overall spectrum, the PH 3 Raman spectra of the v 1 and v 3 bands were calculated. The way in which these bands were calculated is explained and a comparison is made between the experimental and simulated spectra at different temperatures. These comparisons clearly identify the PH 2 v 1 band. By the subtraction of the simulated spectrum from the experimental spectrum, the origin of the PH 2 v 1 band is estimated to be 2310.3 ± 2 cm −1 .