Fourier transform infrared spectroscopy of the BH3 ν2 band

Abstract

The spectrum of the BH3 ν2 band was observed in the 900–1300 cm−1 region with a Fourier transform infrared spectrometer. The borane molecule was produced with a discharge in a B2H6 and He mixture. The observed spectrum was analyzed by including the Coriolis interaction from the ν4 state to determine the molecular constants in the ν2 and ν4 states. The band origins and the Coriolis interaction constant were determined to be ν2 = 1147.4986 (12), ν4 = 1196.66 (12), and D24 = 7.8034 (48) cm−1, with one standard deviation in parentheses. The previous Q-branch assignment of the diode laser spectrum was partly revised.