The ν7, ν8, and ν11 bands of propynal, C2HCHO, in the 650 cm-1 region

A. R W McKellar*, J. K G Watson, Li Kang Chu, Yuan-Pern Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The infrared spectrum of propynal, C2HCHO, is studied at high resolution (0.003 cm-1) in the range 570-640 cm-1. The relatively intense ν11 (C{triple bond, long}C-H out-of-plane bend, 693 cm-1) and ν7 (C{triple bond, long}C-H in-plane bend, 651 cm-1) fundamental bands are linked by a strong a-type Coriolis interaction. The somewhat weaker ν8 (CCO in-plane bend, 614 cm-1) fundamental has a significant Fermi-type interaction with the "dark" background state 3ν9 (∼618 cm-1). About 1400 lines are assigned and analyzed in terms of a four-state fit in order to obtain accurate band origins, rotational and centrifugal distortion parameters, and Fermi and Coriolis interaction parameters. This represents the first systematic high-resolution infrared study of propynal. Crown

Original languageEnglish
Pages (from-to)230-238
Number of pages9
JournalJournal of Molecular Spectroscopy
Issue number2
StatePublished - 1 Dec 2008


  • Coriolis
  • Fermi
  • Infrared
  • Propynal

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