Laboratory detection of the C/sub 3/H radical

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

DOI:https://doi.org/10.1086/184508· OSTI ID:5639849

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

Following the astronomical identification of the C/sub 3/H radical reported in an accompanying Letter, 34 millimeter-wave lines of this linear carbon chain, including six of the lines observed in space, were detected in a laboratory glow discharge through a flowing mixture of C/sub 2/H/sub 2/, He, and CO. Each of the 10 rotational transitions measured, five between 98 and 185 GHz in th /sup 2/Pi/sub 1/2/ ladder and five between 80 and 194 GHz in the /sup 2/Pi/sub 3/2/ 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. An accurate set of spectroscopic constants, which allow calculation of the entire radio spectrum of C/sub 3/H to a radical velocity of 0.1 km s/sup -1/, was derived from a simultaneous fit to the laboratory frequencies and to the well-resolved hfs observed in the narrow-line astronomical source TMC-1.

• Research Organization: Goddard Institute for Space Studies; and Physics Department, Columbia University
• OSTI ID: 5639849
• Journal Information: Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 294:1; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ASTRONOMY
DATA
ELECTRIC DISCHARGES
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
EXPERIMENTAL DATA
FINE STRUCTURE
GLOW DISCHARGES
HYDROCARBONS
HYPERFINE STRUCTURE
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
RADIAL VELOCITY
RADIATIONS
RADIOASTRONOMY
RADIOWAVE RADIATION
ROTATIONAL STATES
SPECTRA
VELOCITY
WAVELENGTHS