The millimeter-wave spectrum of CaH (X2Σ+)

W. L. Barclay, M. A. Anderson, Lucy M Ziurys

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The millimeter-wave spectrum of the CaH and CaD radicals (X2Σ+) 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 → 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 → 1, 1 → 2, and 2 → 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 2Σ 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.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume408
Issue number1 PART 2
StatePublished - 1993
Externally publishedYes

Fingerprint

wave spectrum
millimeter waves
interstellar space
ovens
atomic absorption spectroscopy
spectral resolution
calcium
hydrogen atoms
absorption spectroscopy
hydrogen
vapors
microwaves
high resolution
laboratory

Keywords

  • ISM: Molecules
  • Line: Identification
  • Molecular data

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Barclay, W. L., Anderson, M. A., & Ziurys, L. M. (1993). The millimeter-wave spectrum of CaH (X2Σ+). Astrophysical Journal, 408(1 PART 2).

The millimeter-wave spectrum of CaH (X2Σ+). / Barclay, W. L.; Anderson, M. A.; Ziurys, Lucy M.

In: Astrophysical Journal, Vol. 408, No. 1 PART 2, 1993.

Research output: Contribution to journalArticle

Barclay, WL, Anderson, MA & Ziurys, LM 1993, 'The millimeter-wave spectrum of CaH (X2Σ+)', Astrophysical Journal, vol. 408, no. 1 PART 2.
Barclay, W. L. ; Anderson, M. A. ; Ziurys, Lucy M. / The millimeter-wave spectrum of CaH (X2Σ+). In: Astrophysical Journal. 1993 ; Vol. 408, No. 1 PART 2.
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