Determination of the hyperfine constants for HCCO by pulsed-discharge-nozzle Fourier-transform microwave spectroscopy

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · Journal of Molecular Spectroscopy; (United States)

DOI:https://doi.org/10.1006/jmsp.1993.1142· OSTI ID:6368625

Ohshima, Yasuhiro; Endo, Yasuki ^[1]

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1. Univ. of Tokyo (Japan)

The rotational spectrum of a short-lived free radical, HCCO, has been observed by using a Fabry-Perot-type Fourier-transform microwave spectrometer combined with a pulsed-discharge nozzle. HCCO has been produced by a discharge of a mixture of C[sub 2]H[sub 2] and O[sub 2] diluted in Ar and subsequently cooled to a few Kelvin in a supersonic expansion. All the fine and hyperfine components have been observed for the N = 1-0 rotational transition at 21 GHz. The lines have been analyzed with previously reported data in the submillimeter wave region, leading to a set of the effective constants for the K[sub a] = 0 state. The precisely determined magnetic hyperfine constants for the hydrogen nucleus have been discussed in connection with the electronic and geometrical structures of the radical. Transition frequencies for the hyperfine components of several low-N lines have been tabulated with calculated line strengths, as an aid for future astronomical searches of the radical.

• OSTI ID: 6368625
• Journal Information: Journal of Molecular Spectroscopy; (United States), Vol. 159:2; ISSN 0022-2852
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
KETENES
HYPERFINE STRUCTURE
RADICALS
ACETYLENE
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
ELECTRONIC STRUCTURE
FOURIER TRANSFORM SPECTROMETERS
MICROWAVE SPECTRA
OXYGEN
ALKYNES
ELEMENTS
HYDROCARBONS
MEASURING INSTRUMENTS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
SPECTRA
SPECTROMETERS
YIELDS
664200* - Spectra of Atoms & Molecules & their Interactions with Photons- (1992-)