Zinth, Wolfgang and Kolmeder, Christian and Benna, Bernhard and Irgens-Defregger, Andreas and Fischer, S. F. and Kaiser, Wolfgang
Fast and exceptionally slow vibrational energy transfer in acetylene and phenylacetylene in solution.
In: Journal of Chemical Physics, No. 78: pp. 3916-3921
The excitation of the CH-stretching mode (3) of C2H2 in CCl4 leads to fast population (<2 ps) and very slow depopulation (240 ps) of the symmetric CC-stretching mode (2). The long lifetime of 2 is due to the absence of anharmonic interaction to neighboring states (symmetry forbidden). The corresponding CC-stretching mode of C6H5–C2H has a lifetime of 15 ps. The phenyl group relaxes the symmetry restrictions and introduces new decay channels. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.