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 language | English (US) |
|---|---|
| Journal | Astrophysical Journal |
| Volume | 408 |
| Issue number | 1 PART 2 |
| State | Published - 1993 |
| Externally published | Yes |
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Keywords
- ISM: Molecules
- Line: Identification
- Molecular data
ASJC Scopus subject areas
- Space and Planetary Science
Cite this
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 journal › Article
}
TY - JOUR
T1 - The millimeter-wave spectrum of CaH (X2Σ+)
AU - Barclay, W. L.
AU - Anderson, M. A.
AU - Ziurys, Lucy M
PY - 1993
Y1 - 1993
N2 - 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.
AB - 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.
KW - ISM: Molecules
KW - Line: Identification
KW - Molecular data
UR - http://www.scopus.com/inward/record.url?scp=21144464566&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=21144464566&partnerID=8YFLogxK
M3 - Article
VL - 408
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1 PART 2
ER -