Laboratory detection and pure rotational spectrum of the NaCH radical (X̃ 3Σ-)

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The sodium methylidyne radical, NaCH, has been detected in the laboratory for the first time using submillimeter direct absorption spectroscopy. The species was created in the gas phase in a DC discharge by the reaction of sodium vapor and CH4. Nine rotational transitions of this molecule were recorded in the frequency range 339-520 GHz, and five transitions of its deuterium isotopomer, NaCD. Each transition of sodium methylidyne was found to consist of triplets resulting from fine structure interactions, identifying the ground state of the molecule to be X̃ 3Σ-. The data were analyzed with a 3Σ- Hamiltonian in a case b basis, and rotational, spin-spin, and spin-rotation constants have been accurately determined. NaCH may be formed in the envelopes of AGB stars from the reaction of sodium with photodissociation products of methane.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume508
Issue number1 PART II
StatePublished - 1998

Fingerprint

rotational spectra
sodium
methylidyne
sodium vapor
asymptotic giant branch stars
photodissociation
molecules
deuterium
absorption spectroscopy
envelopes
atomic absorption spectroscopy
methane
frequency ranges
direct current
fine structure
vapor phases
ground state
products
detection
laboratory

Keywords

  • ISM: molecules
  • Line: identification
  • Molecular data

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Laboratory detection and pure rotational spectrum of the NaCH radical (X̃ 3Σ-). / Xin, J.; Ziurys, Lucy M.

In: Astrophysical Journal, Vol. 508, No. 1 PART II, 1998.

Research output: Contribution to journalArticle

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