Infrared diode laser spectroscopy of a high-temperature molecule: GeSe

The vibrational-rotational spectrum of GeSe has been observed with diode laser spectrometer equipped with a single pass cell of heat-pipe oven type. About 770 spectral lines for the Δv = 1 band sequences of six isotopomers of GeSe have been assigned between 380 to 420 cm−1. These data have been analyzed in combination with 138 microwave data from the literature by two different methods of least-squares fit to different potential functions. The qualities of the fits are nearly equal. The value of ωe is determined to be 402.66129(70) cm−1 for 74Ge80Se.