The millimeter-wave spectrum of CaH (X2Σ+)

W. L. Barclay; M. A. Anderson; L. M. Ziurys

doi:10.1086/186832

The millimeter-wave spectrum of CaH (X²Σ⁺)

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

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

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)
Pages (from-to)	L65-L67
Journal	Astrophysical Journal
Volume	408
Issue number	1 PART 2
DOIs	https://doi.org/10.1086/186832
State	Published - 1993
Externally published	Yes

Keywords

ISM: Molecules
Line: Identification
Molecular data

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1086/186832

Fingerprint Dive into the research topics of 'The millimeter-wave spectrum of CaH (X<sup>2</sup>Σ<sup>+</sup>)'. Together they form a unique fingerprint.

Cite this

@article{1926b1b0526c44739a1b1cf4c944ac75,

title = "The millimeter-wave spectrum of CaH (X2Σ+)",

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.",

keywords = "ISM: Molecules, Line: Identification, Molecular data",

author = "Barclay, {W. L.} and Anderson, {M. A.} and Ziurys, {L. M.}",

year = "1993",

doi = "10.1086/186832",

language = "English (US)",

volume = "408",

pages = "L65--L67",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1 PART 2",

}

TY - JOUR

T1 - The millimeter-wave spectrum of CaH (X2Σ+)

AU - Barclay, W. L.

AU - Anderson, M. A.

AU - Ziurys, L. 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

U2 - 10.1086/186832

DO - 10.1086/186832

M3 - Article

AN - SCOPUS:21144464566

VL - 408

SP - L65-L67

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 PART 2

ER -