Laboratory detection and submillimeter spectrum of the NaS radical (X2IIi)

B. Z. Li, Lucy M Ziurys

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The sodium sulfide radical NaS has been observed in the laboratory for the first time using millimeter/ submillimeter direct absorption spectroscopy. Twelve rotational transitions originating in both the Ω = 1/2 and 3/2 sublevels of this species in its X2IIi ground state were recorded in the frequency range 200-400 GHz. Splittings arising from lambda-doubling interactions were resolved in both spin-orbit components and were particularly large (∼2.9 GHz) in the Ω = 1/2 substate. The data were analyzed using a 2II Hamiltonian, and rotational, spin-orbit, and lambda-doubling parameters were determined. NaS may be detectable in the late-type star IRC + 10216, given the observation of CS, SiS, NaCl, and NaCN in this object.

Original languageEnglish (US)
JournalAstrophysical Journal
Issue number2 PART II
Publication statusPublished - 1997



  • ISM: molecules
  • Line: identification
  • Molecular data

ASJC Scopus subject areas

  • Space and Planetary Science

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