The Rotational Spectra of H2CCSi and H2C4Si

✍ Scribed by M.C. McCarthy; P. Thaddeus

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 121 KB
• Volume: 211
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.2001.8467

✦ Synopsis

The microwave rotational spectra of two singlet chains H 2 CCSi and H 2 C 4 Si, have been observed in a pulsed supersonic molecular beam by Fourier transform microwave spectroscopy. Following detection of the singly substituted rare isotopic species and D 2 CCSi, an experimental structure (r 0 ) has been determined to high accuracy for H 2 CCSi by isotopic substitution. In addition, the rotational transitions of the 29 Si and the two 13 C isotopic species of H 2 CCSi exhibit nuclear spin-rotation hyperfine structure. The component of the spin-rotation tensor along the a-inertial axis is abnormally large for each of these isotopic species, especially for that with 29 Si, where the magnitude of C aa is in excess of 700 kHz.