Abstract
The 920 cm-1 vibrational band of acetaldehyde (CH3CHO) has been studied at about 2 MHz (FWHM) resolution using an electric resonance optothermal spectrometer and a tunable microwave-sideband CO2 laser. Microwave and radiofrequency infrared double resonance and precise combination differences are used to assign the spectrum and verify that it originates from the vibrational ground state of the molecule. The band is observed to have a large A-E torsional tunnelling splitting of 1·45 cm-1, with the A state higher in energy than the E state. The K′ = 1 and 2 levels for the E state have large K splittings of 28·8 GHz and 54·5 GHz, respectively, which are similar to the 37·3 GHz and 58·4 GHz splittings found for the first excited torsional vibration of the ground vibrational state. The above observations demonstrate that the 920 cm-1 vibrational state has one quantum of torsional excitation, confirming previous low-resolution assignments of the band to the A′ v 14 + v 15 combination vibration, consisting of the...
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
