Journal
CHEMICAL PHYSICS
Volume 341, Issue 1-3, Pages 200-206Publisher
ELSEVIER
DOI: 10.1016/j.chemphys.2007.06.038
Keywords
carboxylic acid dimers; propionic acid; femtosecond pump probe spectroscopy; infrared spectroscopy; vibrational energy relaxation
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Ultrafast IR-pump IR-probe spectroscopy is used to study the relaxation dynamics of propionic acid dimers. The spectral changes in the regions of CO-stretching at similar to 1700 cm(-1), OH and CH-bending modes around 1400 cm-1 are investigated after excitation in the range of the CH- and CO-stretching modes. A strong coupling of the OH-stretch vibration to CO-stretching and OH/CH-bending modes is found. The intramolecular redistribution of vibrational energy takes place on a 1 ps time-scale. A further cooling process and energy transfer to the surrounding occur with similar to 12 ps. The dynamics depend on the wavelength of the IR-excitation and point to a transient breaking of one of the two H-bonds of the propionic acid dimers. (C) 2007 Published by Elsevier B.V.
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