Formation of a CO-CH4 complex in thin solid films below 50 K

W Z Alsindi, D O Gardner, E F van Dishoeck, H J Fraser

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7 Citations (Scopus)


We have investigated the physical and chemical behaviour of pure-, mixed-, layered-, and thin-solid films of CO and CH4 using Fourier Transform Infrared Spectroscopy. Very little difference exists between the sublimation behaviour of the films. In contrast, a significant spectral feature was observed at similar to2136 cm(-1) only in the mixed CO:CH4 films, and was replicated by ab initio calculations on the gas-phase CO-CH4 complex. The complex is due to a 'pseudo-double pi-hydrogen bond', with binding energy of around 14 kJ mol(-1). To the best of our knowledge this is the first report of this complex. 

Original languageEnglish
Pages (from-to)178-184
Number of pages7
JournalChemical Physics Letters
Issue number1-2
Publication statusPublished - 29 Aug 2003


  • carbon monoxide
  • infrared spectra
  • ices
  • matrices


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