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

Autor:	W. L. Barclay, M. A. Anderson, L. M. Ziurys
Rok vydání:	1993
Předmět:	Physics Absorption spectroscopy Hydrogen Analytical chemistry Rotational transition chemistry.chemical_element Astronomy and Astrophysics Interstellar medium Nuclear magnetic resonance chemistry Space and Planetary Science Non-linear least squares Spectral resolution Hyperfine structure Microwave
Zdroj:	The Astrophysical Journal. 408:L65
ISSN:	1538-4357 0004-637X
DOI:	10.1086/186832
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d3c323c84a3e1182ae3b3e83e6179ff7 https://doi.org/10.1086/186832 Zobrazit plný text záznamu