期刊
CHEMICAL PHYSICS LETTERS
卷 354, 期 5-6, 页码 409-416出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0009-2614(02)00152-5
关键词
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The intramolecular excited-state proton transfer (ESIPT) and internal conversion (IC) of o-hydroxybenzaldehyde was investigated by transient absorption measurements with 30 fs time resolution and quantitative fluorescence spectroscopy. A 45 fs delayed rise of the product emission and coherently excited vibrations indicate that the ESIPT is a ballistic motion of a well defined wavepacket along skeletal coordinates of the H-chelate ring. The IC proceeds as thermally activated process over an energy barrier of about 200 meV caused by an avoided crossing between the pipi*- and pisigma*-state. The coordinates involved in the ESIPT and in the IC are found to be orthogonal. (C) 2002 Elsevier Science B.V. All rights reserved.
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