The laboratory spectrum of acetaedehyde at 1 millimeter (230-325 GHz)

W. L. Barclay, M. A. Anderson, L. M. Ziurys, I. Kleiner, J. T. Hougen

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


The rotational spectrum of acetaldehyde (CH3CHO) in the frequency range 230-325 GHz has been measured in the laboratory using millimeter/submillimeter direct absorption spectroscopy. Over 250 transition frequencies are presented for this molecule for both A and E symmetry species in its ground (vt = 0) and first excited (vt = 1) torsional state, with experimental uncertainties of ±50 kHz. The data were fitted with a model involving an internal rotation potential function, which typically reproduces the measured frequencies to vobs - vcalc ≲ 50 kHz for both ground and vt = 1 state. These newly measured rest frequencies should aid in the identification of interstellar CH3CHO and in spectral line assignments for millimeter-band scans.

Original languageEnglish (US)
Pages (from-to)221-226
Number of pages6
JournalAstrophysical Journal, Supplement Series
Issue number1
StatePublished - 1993


  • Line: identification
  • Radio lines: general
  • Techniques: spectroscopic

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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