Analysis of the High-Resolution Fourier Transform Infrared Spectra of the ν3and ν5Bands of Thionylimide (HNSO)

The first high-resolution (0.002 cm−1) infrared spectra of the reactive molecule thionylimide, HNSO, are reported. The ν3(NS stretching) and ν5(NSO bending) fundamentals at 1086 and 448 cm−1, respectively, have been analyzed in detail. The ground state rotational constants have been substantially improved by a simultaneous fitting of previously reported microwave data and a large number of infrared combination differences. The excited vibrational state constants of both typeA/Bhybrid bands have been obtained from fitting assignments over a wide range ofJandKavalues. No perturbations were detected in either band.