Laboratory detection of the C3H radical

Journal Article · Mon Jul 01 04:00:00 EDT 1985 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/184508· OSTI ID:5799155

Gottlieb, C A; Vrtilek, J M; Gottlieb, E W; Thaddeus, P; Hjalmarson, A

Millimeter-wave lines of the C3H radical, including six of the lines observed in space, were detected in a laboratory glow discharge through a flowing mixture of C2H2, He, and CO. Each of the 10 rotational transitions measured, five between 98 and 185 GHz in the 2Pi1/2 ladder and five between 80 and 194 GHz in the 2Pi3/2 ladder, is split by lambda-type doubling, and all but three possess resolved hyperfine structure. The excellent agreement between the fine-structure, rotation, lambda-doubling, and hyperfine constants derived from the laboratory data and from the astronomical observations conclusively confirms the identifications in IRC +10216 and TMC-1 by Thaddeus and colleagues (1985). An accurate set of spectroscopic constants, which allow calculation of the entire radio spectrum of C3H to a radial velocity of 0.1 km/s, was derived from a simulataneous fit to the laboratory frequencies and to the well-resolved hfs observed in the narrow-line astronomical source TMC-1. 15 references.

• Research Organization: NASA, Goddard Institute for Space Studies, New York, NY; Columbia Univ., New York, NY; Onsala Rymdobservatorium, Sweden
• OSTI ID: 5799155
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 294; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHEMICAL COMPOSITION
FINE STRUCTURE
HYDROCARBONS
INTERSTELLAR SPACE
MOLECULES
ORGANIC COMPOUNDS
RADICALS
SPACE
SPECTROSCOPY