Millimeter wave spectrum of methyldiacetylene, CH3C4H

Details Millimeter wave spectrum of methyldiacetylene, CH3C4H Millimeter wave spectrum of methyldiacetylene, CH3C4H

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...137l..20b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 137, no. 2, Aug. 1984, p. L20-L22. Sponsorship: Deutsche Forschungsgemeinschaf

Astronomy and Astrophysics

Astrophysics

8

Acetylene, Ground State, Methyl Compounds, Microwave Spectra, Molecular Spectra, Dipole Moments, Millimeter Waves, Molecular Rotation, Rotational Spectra

Scientific paper

The ground-state rotational spectrum of methyldiacetylene (CH3C4H) is measured between eight and 224 GHz. Precise values are obtained for the rotational constant and the P4 and P6 centrifugal distortion constants. For the rotational constant a value of 2035.74706 (+ or - 8) MHz was obtained. From the J = 2 - 1 transition the electric dipole moment was determined to be 1.2071 (+ or - 20) Debye. For CH3C3N a moment of 4.75 Debye was obtained. On the basis of these data the dipole moments of CH3C6H and CH3C5N are estimated to be about 1.5 (+ or - 1) and 5.4 (+ or - 1) Debye, respectively. It is concluded on the basis of the dipole moment values that CH3C6H is abundant enough to be detected in interstellar space.

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