The pure rotational spectrum of KH (X1Σ+): Quadrupole coupling in alkali hydrides

M. A. Brewster, L. M. Ziurys

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5 Scopus citations


The pure rotational spectrum of KH (X1Σ+) has been recorded using millimeter/submillimeter direct absorption techniques. The species was created by the reaction of potassium vapor and H2 in a d.c. discharge. The J = 0 → 1 and 1 → 2 transitions were measured near 202 and 404 GHz, and electric quadrupole splittings were resolved in the J = 0 → 1 line and partly resolved in the other transition. For comparison, the quadrupole structure in the J = 0 → 1 transition of NaH (X1Σ+) was also recorded. Very accurate rotational and quadrupole hyperfine constants were determined for KH, and eqQ was established for NaH as well. Diatomic hydride species are the building blocks for interstellar chemistry in both dense and diffuse gas. Knowledge of the rest frequencies of KH will enable its detection in such objects.

Original languageEnglish (US)
Pages (from-to)1190-1193
Number of pages4
JournalAstrophysical Journal
Issue number2 PART 1
StatePublished - Oct 1 2001


  • ISM: molecules
  • Line: identification
  • Methods: laboratory
  • Molecular data

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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