The millimeter-wave spectrum of AlOH

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

Research output: Contribution to journalArticlepeer-review

59 Scopus citations


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)
Pages (from-to)L129-L132
JournalAstrophysical Journal
Issue number2 PART 2
StatePublished - Sep 10 1993


  • ISM: molecules
  • Line: identification
  • Molecular data

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'The millimeter-wave spectrum of AlOH'. Together they form a unique fingerprint.

Cite this