The millimeter-wave spectrum of CaH (X 2Sigma(+))

Details The millimeter-wave spectrum of CaH (X 2Sigma(+)) The millimeter-wave spectrum of CaH (X 2Sigma(+))

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...408l..65b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 408, no. 1, p. L65-L67.

Astronomy and Astrophysics

Astrophysics

14

Calcium Compounds, Interstellar Matter, Metal Hydrides, Microwave Spectra, Molecular Structure, Millimeter Waves, Rotational Spectra

Scientific paper

The millimeter-wave spectrum of the CaH and CaD radicals (X 2Sigma(+)) has been observed in the laboratory via direct absorption spectroscopy. The species were generated by the reaction of calcium vapor, produced in a Broida-type oven, with hydrogen atoms created in a microwave discharge. The six hyperfine components of the N = 0 yields 1 rotational transition of CaH near 254 GHz were resolved and their frequencies determined to an accuracy of +/- 100 kHz. The main hyperfine lines originating in the N = 0 yields 1, 1 yields 2, and 2 yields 3 rotational transitions of CaD were also detected. Spectroscopic constants were determined for both radicals from a nonlinear least squares fit to the data, using a 2Sigma Hamiltonian. These measurements constitute the first laboratory observation of CaH at high spectral resolution, and are essential to the detection of this radical in interstellar space.

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