Laboratory measurement of the 1(01)-0(00) transition and electric dipole moment of SiC sub 2. [In interstellar space]

Journal Article · Sat Jul 01 00:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/185495· OSTI ID:5556413

Suenram, R D; Lovas, F J; Matsumura, K ^[1]

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1. NIST, Gaithersburg, MD (USA)

A laser-ablation source coupled to a pulsed-nozzle Fabry-Perot Fourier-transform microwave spectrometer is used to investigate the 1(01)-0(00) transition in (Si-28)C2, (Si-29)C2, and (Si-30)C2. The results are presented in tables, and the frequencies are found to be 23.600242(4), 23.257511(8), and 22.937583(8) GHz, respectively. From the electric dipole moment determined for (Si-28)C2, the SiC2 column density toward the evolved carbon star IRC + 10216 is estimated as 2.7 x 10 to the 14th/sq cm. This experimentally based value is shown to be about twice that calculated on the basis of theoretical dipole moments by Thaddeus et al. (1984). 12 refs.

• OSTI ID: 5556413
• Journal Information: Astrophysical Journal; (USA), Vol. 342; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
INTERSTELLAR SPACE
CHEMICAL COMPOSITION
SILICON CARBIDES
ENERGY-LEVEL TRANSITIONS
CARBON STARS
ELECTRIC DIPOLES
FOURIER TRANSFORMATION
LABORATORIES
SPECTROMETERS
STAR EVOLUTION
CARBIDES
CARBON COMPOUNDS
DIPOLES
INTEGRAL TRANSFORMATIONS
MAIN SEQUENCE STARS
MEASURING INSTRUMENTS
MULTIPOLES
SILICON COMPOUNDS
SPACE
STARS
TRANSFORMATIONS
640105* - Astrophysics & Cosmology- Galaxies