Precise Laboratory Observation of the 3P 2 3P 1 Fine-Structure Transitions of 12C and 13C

Details Precise Laboratory Observation of the 3P 2 3P 1 Fine-Structure Transitions of 12C and 13C Precise Laboratory Observation of the 3P 2 3P 1 Fine-Structure Transitions of 12C and 13C

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...494l.125k&link_type=abstract

Astrophysical Journal Letters v.494, p.L125

Astronomy and Astrophysics

Astronomy

11

Atomic Processes, Line: Identification, Ism: Abundances, Methods: Laboratory

Scientific paper

We report measurements of the 3P2<--3P1 fine-structure transitions of both neutral atomic carbon species, 12 C and 13 C, near 809 GHz with the Cologne terahertz spectrometer. The carbon atoms were produced in a DC glow discharge of a CO and He mixture at liquid nitrogen temperature. The 13 C atoms were generated from an isotopically enriched 13 CO sample. The 3P2<--3P1 transition frequencies measured in absorption are determined to be 12{C}: J=2<--1: 809341.97(5) {MHz,}13{C}: J=2<--1,F={\textstyle \frac {3}{2} }<--{\textstyle \frac {1}{2} }: 809125.5(4) {MHz,}F={\textstyle \frac {5}{2} }<--{\textstyle \frac {3}{2} }: 809493.7(2) {MHz,}F={\textstyle \frac {3}{2} }<--{\textstyle \frac {3}{2} }: 809121.3(4) {MHz} ({calculated}). These precise laboratory data are recommended for use as rest frequencies in future astronomical observations. The new value for the rest frequency of the 12 C (J=2<--1) transition removes a long-standing uncertainty and small discrepancy between existing laboratory data and astronomical measurements. The 13 C rest frequencies have supported the first interstellar detection of this species, as reported by Keene et al.

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