Infrared Laser Spectroscopy of Jet-Cooled Chromium Hexacarbonyl in the 5-μm Region

✍ Scribed by G.M. Hansford; P.B. Davies

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 701 KB
• Volume: 168
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1300

✦ Synopsis

The infrared spectrum of chromium hexacarbonyl near (2000 \mathrm{~cm}^{-1}) has been rotationally resolved by cooling in a supersonic jet. Spectroscopic parameters have been obtained for the weakly perturbed (\nu_{6}) carbonyl stretching fundamental of ({ }^{52} \mathrm{Cr}\left({ }^{12} \mathrm{C}^{16} \mathrm{O}\right){6}) and the unperturbed, overlapped (v{6}) fundamentals of the isotopomers ({ }^{50.53 .54} \mathrm{Cr}\left({ }^{12} \mathrm{C}^{16} \mathrm{O}\right){6}). A likely candidate for the perturbing state is proposed. Observation of a perpendicular band of the symmetric-top molecule ({ }^{52} \mathrm{Cr}\left({ }^{12} \mathrm{C}{ }^{16} \mathrm{O}\right){ }{5}^{13} \mathrm{C}^{16} \mathrm{O}) 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. (c) 1994 Academic Press, Inc.