High-resolution Fourier-transform infrared spectroscopy of ν3+ν8 H2CCS, ν1 HDCCS and ν1 D2CCS in the gas phase: an improved rS structure for thioketene
Abstract
The ν3+ν8 combination band of H2CCS and the C—D ν1 stretching fundamentals of HDCCS and D2CCS in the gas phase have been investigated by high-resolution FTIR spectroscopy. All upper vibrational levels were perturbed. This investigation has yielded accurate values for the ground-state A rotational constant for all three isotopomers and this has enabled the positions of the hydrogen nuclei to be precisely fixed in an rs structure. In addition, the fundamental frequencies for all three isotopomers from both low- and high-resolution spectra are presented.