Abstract
We report the first observation of the far-infrared laser magnetic resonance spectrum associated with the J = 2 c 1 fine-structure interval of Si and 29Si in the 3P ground state. In Si this separation is 4378.3280(2) GHz, and for 29Si it is 4378.3306(6) GHz. The magnetic hyperfine parameter A, has also been determined for *'Si, apparently for the first time. The value obtained corresponds to a value for the electronic expectation value (T-~), of 1.626 x 1031 m-3. Zero-field transition frequencies for the hyperfine components of the J = 2 t 1 transition in 29Si are determined and will aid in their identification in interstellar sources. Subject headings: atomic data - line: identification
Published Version
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