Abstract
The infrared spectrum of chromium hexacarbonyl near 2000 cm−1 has been rotationally resolved by cooling in a supersonic jet. Spectroscopic parameters have been obtained for the weakly perturbed ν6 carbonyl stretching fundamental of 52Cr(12C16O)6 and the unperturbed, overlapped ν6 fundamentals of the isotopomers 50,53,54Cr(12C16O)6. A likely candidate far the perturbing state is proposed. Observation of a perpendicular band of the symmetric-top molecule 52Cr(12C16O)513C16O in the same region permitted an improvement in the accuracy of the bond lengths of gas-phase chromium hexacarbonyl. All the isotopomers were observed in natural abundance.
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