Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341.1114s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 15, 1989, p. 1114-1119. Research supported by the Inoue Foundatio
Astronomy and Astrophysics
Astrophysics
20
Free Radicals, Interstellar Matter, Microwave Spectra, Molecular Rotation, Carbon, Line Spectra, Phosphorus, Spectrum Analysis
Scientific paper
The rotational spectrum of the CP radical was detected in the laboratory by using a source-modulated microwave spectrometer combined with a free space absorption cell. The CP radical was produced by a dc-glow discharge in a mixture of PH3, CH4, and He. Nineteen lines of five rotational transitions were observed in the frequency region of 95-334 GHz and were least-squares analyzed to determine the molecular constants: the rotational constant, the centrifugal distortion constant, the spin-rotation coupling constant, and hyperfine coupling constants for the phosphorus nucleus. Based on the measured and calculated line frequencies, astronomical searches for the interstellar CP radical were made in Orion-KL, Sgr B2, W51A, TMC-1, and IRC + 10216, for which upper limits to the column density were estimated.
Ishikawa Shin-Ichi
Kaifu Norio
Kawaguchi Kentarou
Ohishi Masatoshi
Saito Shuji
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