Rest frequencies for alkaline earth hydroxide radicals (X2Σ+)

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

Research output: Contribution to journalArticle

12 Scopus citations


Rest frequencies for the pure rotational transitions of the alkaline earth hydroxide radicals MgOH, CaOH, SrOH, and BaOH are presented. These data were obtained using millimeter/submillimeter direct absorption spectroscopy in the range 100-400 GHz. The hydroxide molecules, which all have 2Σ+ ground electronic states, were created by the reaction of hydrogen peroxide and metal vapor, produced in a Broida-type oven. Transitions arising in the ground (000) state as well as excited vibrational modes (0110), (0200), (0220), and (100), were recorded. Fine-structure splittings were resolved in every transition. The data were analyzed using a 2Σ Hamiltonian, and rotational, fine-structure, and l-type doubling constants were determined for the radicals. These measurements will enable the identification of the alkaline earth hydroxide species in the interstellar medium.

Original languageEnglish (US)
Pages (from-to)425-434
Number of pages10
JournalAstrophysical Journal, Supplement Series
Issue number2
StatePublished - Feb 1 1996
Externally publishedYes


  • Line: identification
  • Methods: laboratory
  • Molecular data
  • Techniques: spectroscopic

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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