The Rotational Spectra of H2CCSi and H2C4Si |
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Authors: | MC McCarthyP Thaddeus |
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Institution: | Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts, 02138 Division of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, Massachusetts, 02138 |
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Abstract: | The microwave rotational spectra of two singlet chains H2CCSi and H2C4Si, have been observed in a pulsed supersonic molecular beam by Fourier transform microwave spectroscopy. Following detection of the singly substituted rare isotopic species and D2CCSi, an experimental structure (r0) has been determined to high accuracy for H2CCSi by isotopic substitution. In addition, the rotational transitions of the 29Si and the two 13C isotopic species of H2CCSi 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 29Si, where the magnitude of Caa is in excess of 700 kHz. |
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