Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..325l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 1, p. 325-329.
Astronomy and Astrophysics
Astrophysics
31
Electric Dipoles, Free Radicals, Hydrocarbons, Interstellar Matter, Microwave Spectra, Sulfur Compounds, Astronomical Spectroscopy, Electron Transitions, Fabry-Perot Spectrometers, Molecular Rotation
Scientific paper
A number of low-J rotational transitions have been measured for the radical or transient molecular species, SO, C2S, C3S, c-HC3, CH2CC, and c-C3H2. Measurements were made with a pulsed nozzle, Fabry-Perot cavity, Fourier transform microwave spectrometer equipped with a dc voltage, electric discharge nozzle. Helmholtz coils around the outside of the vacuum chamber were used to maintain the magnetic field within the active volume element of the Fabry-Perot cavity to less than 10 mG. The transition frequencies measured are accurate in most instances to 4 kHz, thus allowing the molecular dynamics of cold interstellar cloud to be determined with improved accuracy. In addition, the molecular electric dipole moments have been determined for SO, C3S, c-HC3, and c-C3H2 from Stark effect measurements.
Lovas Francis J.
Ogata T.
Suenram Richard D.
Yamamoto Shoji
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