Laboratory Microwave Spectroscopy of Simple Transient Molecules Related to Astrochemistry

Physics

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Scientific paper

A Fourier transform millimeter-wave spectrometer which is operative up to 52 GHz has been developed to study rotational spectra of simple transient molecules with astrochemical interests. With this spectrometer, the 101-000 rotational transitions of the HCCl carbene and its isotopic species have been detected, and hyperfine interaction constants due to the Cl nucleus have been determined accurately. The rotational spectrum of the HCS radical has also been detected for the first time in the laboratory. The Fermi contact term of HCS is fairly small, indicating the quasilinear nature of this molecule. Radioastronomical searchs for HCCl and HCS have been carried out without success. In addition to the above spectroscopic studies, the recent status of the Mt. Fuji submillimeter-wave telescope is presented briefly.

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