Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...370l.103y&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 370, April 1, 1991, p. L103-L105.
Astronomy and Astrophysics
Astrophysics
22
Abundance, Carbon 12, Carbon 13, Electron Transitions, Interstellar Chemistry, Interstellar Matter, Absorption Spectroscopy, Carbon Monoxide, Helium, Hyperfine Structure, Submillimeter Waves
Scientific paper
The 3P1-3P0 transitions of the neutral C-12 and C-13 atoms are observed by laboratory microwave spectroscopy. The carbon atom is produced by discharging a gaseous mixture of CO and He at the liquid nitrogen temperature. The transition frequency is precisely determined for (C-12)T to be 492160.651 + or - 0.055 MHz, where the error is three standard deviations in the frequency measurements. Two hyperfine components, F = 3/2-1/2 and F = 1/2-1/2, are observed for (C-13)I at 492164.276 + or - 0.072 MHz and 492160.147 + or - 0.168 MHz, respectively. The precise laboratory values are recommended as rest frequencies in astronomical observations.
Saito Shuji
Yamamoto Satoshi
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