The millimeter/submillimeter spectrum and rotational rest frequencies of mgch3(X 2a1)

M. A. Anderson; L. M. Ziurys

doi:10.1086/309733

The millimeter/submillimeter spectrum and rotational rest frequencies of mgch3(X 2a1)

M. A. Anderson
, L. M. Ziurys

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

35 Scopus citations

Abstract

The pure rotational spectrum of the free radical MgCH₃(X ²A₁) has been measured in the laboratory for the first time using millimeter/submillimeter direct absorption spectroscopy. The molecule was made in a DC discharge by the reaction of magnesium vapor and dimethyl mercury. Ten rotational transitions of this species were observed in the range 176-374 GHz. MgCH₃is a symmetric top molecule with net spin angular momentum. Consequently, both K structure and spin-rotation interactions were observed in every rotational transition. The data were analyzed with a ²A₁Hamiltonian and rotational, centrifugal distortion, and fine-structure parameters were accurately determined. These measurements will now enable a search for this radical in interstellar and circumstellar sources to be conducted using millimeter/submillimeter telescopes.

Original language	English (US)
Pages (from-to)	L157-L160
Journal	Astrophysical Journal
Volume	452
Issue number	2
DOIs	https://doi.org/10.1086/309733
State	Published - Oct 20 1995

Keywords

ISM: Molecules
Line: Identification
Methods: Laboratory
Molecular data

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1086/309733

Cite this

@article{2805614a64f44ad6b3f042937089fa77,

title = "The millimeter/submillimeter spectrum and rotational rest frequencies of mgch3(X 2a1)",

abstract = "The pure rotational spectrum of the free radical MgCH3(X 2A1) has been measured in the laboratory for the first time using millimeter/submillimeter direct absorption spectroscopy. The molecule was made in a DC discharge by the reaction of magnesium vapor and dimethyl mercury. Ten rotational transitions of this species were observed in the range 176-374 GHz. MgCH3is a symmetric top molecule with net spin angular momentum. Consequently, both K structure and spin-rotation interactions were observed in every rotational transition. The data were analyzed with a 2A1Hamiltonian and rotational, centrifugal distortion, and fine-structure parameters were accurately determined. These measurements will now enable a search for this radical in interstellar and circumstellar sources to be conducted using millimeter/submillimeter telescopes.",

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

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

note = "Funding Information: This work was supported by NSF grant AST-92-53682 and NASA grant NAGW 2989. The authors thank Peter Bernath for suggesting the appropriate methyl precursors, Terry Miller for communicating his results prior to publication, and Chris Brazier for use of his Hamiltonian code and for many helpful suggestions.",

year = "1995",

month = oct,

day = "20",

doi = "10.1086/309733",

language = "English (US)",

volume = "452",

pages = "L157--L160",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

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TY - JOUR

T1 - The millimeter/submillimeter spectrum and rotational rest frequencies of mgch3(X 2a1)

AU - Anderson, M. A.

AU - Ziurys, L. M.

N1 - Funding Information: This work was supported by NSF grant AST-92-53682 and NASA grant NAGW 2989. The authors thank Peter Bernath for suggesting the appropriate methyl precursors, Terry Miller for communicating his results prior to publication, and Chris Brazier for use of his Hamiltonian code and for many helpful suggestions.

PY - 1995/10/20

Y1 - 1995/10/20

N2 - The pure rotational spectrum of the free radical MgCH3(X 2A1) has been measured in the laboratory for the first time using millimeter/submillimeter direct absorption spectroscopy. The molecule was made in a DC discharge by the reaction of magnesium vapor and dimethyl mercury. Ten rotational transitions of this species were observed in the range 176-374 GHz. MgCH3is a symmetric top molecule with net spin angular momentum. Consequently, both K structure and spin-rotation interactions were observed in every rotational transition. The data were analyzed with a 2A1Hamiltonian and rotational, centrifugal distortion, and fine-structure parameters were accurately determined. These measurements will now enable a search for this radical in interstellar and circumstellar sources to be conducted using millimeter/submillimeter telescopes.

AB - The pure rotational spectrum of the free radical MgCH3(X 2A1) has been measured in the laboratory for the first time using millimeter/submillimeter direct absorption spectroscopy. The molecule was made in a DC discharge by the reaction of magnesium vapor and dimethyl mercury. Ten rotational transitions of this species were observed in the range 176-374 GHz. MgCH3is a symmetric top molecule with net spin angular momentum. Consequently, both K structure and spin-rotation interactions were observed in every rotational transition. The data were analyzed with a 2A1Hamiltonian and rotational, centrifugal distortion, and fine-structure parameters were accurately determined. These measurements will now enable a search for this radical in interstellar and circumstellar sources to be conducted using millimeter/submillimeter telescopes.

KW - ISM: Molecules

KW - Line: Identification

KW - Methods: Laboratory

KW - Molecular data

UR - https://www.scopus.com/pages/publications/79960834369

UR - https://www.scopus.com/pages/publications/79960834369#tab=citedBy

U2 - 10.1086/309733

DO - 10.1086/309733

M3 - Article

AN - SCOPUS:79960834369

SN - 0004-637X

VL - 452

SP - L157-L160

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

The millimeter/submillimeter spectrum and rotational rest frequencies of mgch3(X 2a1)

Abstract

Keywords

ASJC Scopus subject areas

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