The millimeter and sub-millimeter spectrum of the BaOH radical

M. A. Anderson, M. D. Allen, W. L. Barcaly, L. M. Ziurys

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


The pure rotational spectrum of the X2Σ+ ground electronic states of the BaOH and BaOD radicals has been observed using millimeter/sub-millimeter direct absorption spectroscopy. The lesser abundant isotopically substituted species, 136BaOH and 137BaOH, have been detected as well. The radicals were created by reacting barium metal vapor, produced in a Broida-type oven, with either H2O2 or D2O2. The rotational and spin-rotation constants were determined for the molecules from a nonlinear leastsquares fit to the data, using a 2Σ Hamiltonian. Hyperfine constants were also derived for 137BaOH, the one species where hyperfine structure was resolved. These measurements confirm a linear structure for BaOh.

Original languageEnglish (US)
Pages (from-to)415-422
Number of pages8
JournalChemical Physics Letters
Issue number4-5
StatePublished - Apr 16 1993

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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