The millimeter-wave spectrum of AlOH

A. J. Apponi, W. L. Barclay, Lucy M Ziurys

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The pure rotational spectrum of the AlOH and AlOD molecules in their X1Σ+ (v = 0) ground electric states has been measured in the laboratory using direct absorption millimeter/sub-millimeter spectroscopy. The species were produced by the reaction of aluminum vapor, created in a Broida-type oven, with hydrogen peroxide or D2O2. Eight rotational transitions of AlOH and five transitions for AlOD were measured in the frequency range of 157-378 GHz to an accuracy better than ±75 kHz. Electric quadrupole interactions, arising from the aluminum nuclear spin of 5/2, were observed in the J = 4 → 5 and the J = 5 → 6 transitions of AlOH. The rotational constants of these molecules have been determined from a nonlinear least-squares fit to the data. The electric quadrupole coupling constant, eqQ, has been measured as well, and was found to have a value of -42.4 ± 4.3 MHz. The spectra are consistent with quasi-linear ground states for AlOH and AlOD, as predicted by theory. AlOH is of astrophysical interest because of the relatively high cosmic abundance of aluminum.

Original languageEnglish (US)
JournalAstrophysical Journal
Issue number2 PART 2
Publication statusPublished - Sep 10 1993
Externally publishedYes



  • ISM: molecules
  • Line: identification
  • Molecular data

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Apponi, A. J., Barclay, W. L., & Ziurys, L. M. (1993). The millimeter-wave spectrum of AlOH. Astrophysical Journal, 414(2 PART 2).