Rest frequencies for alkaline earth hydroxide radicals (X2Σ+)

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

Research output: Contribution to journalArticlepeer-review

15 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 1996


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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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