Rotation-Vibration Spectra of Malonaldehyde Obtained with Far-Infrared Synchrotron Radiation

Details Rotation-Vibration Spectra of Malonaldehyde Obtained with Far-Infrared Synchrotron Radiation Rotation-Vibration Spectra of Malonaldehyde Obtained with Far-Infrared Synchrotron Radiation

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mss..conferg05t&link_type=abstract

"International Symposium On Molecular Spectroscopy, 66th Meeting, Held 20-24 June, 2011 at Ohio State University. http://molspec

Physics

Infrared/Raman

Scientific paper

Malonaldehyde is an open 5-membered ring molecule which exhibits interesting quantum-mechancial effects due to tunnelling of one of its protons. This results in a 21 Cm-1 tunnelling-splitting in the ground vibrational state, which has been well-studied by microwave spectroscopy. We have taken far-infrared Fourier transform spectra of malonaldehyde at the Canadian Light Source synchrotron, and have recorded a number of rotation-vibration fundamental bands between 100-1000 Cm-1 at 0.00096 Cm-1 resolution. The data permit us to determine with high precision the changes in the tunnelling-splitting induced by vibrational excitation. We have also observed spectra at 240 and 219 Cm-1 that appear to be transitions from the two components of the ground vibrational state to a common upper state that is not mentioned in conventional vibrational analyses of malonaldehyde. We will offer suggestions as to the nature of the newly-observed state.
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