期刊
CHEMICAL PHYSICS LETTERS
卷 372, 期 5-6, 页码 899-903出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0009-2614(03)00535-9
关键词
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Photochemical reactions induced by two-photon-absorption processes offer several advantages over common one-photon initiated photoreactions, e.g., three-dimensional spatial control. We present the photocleavage reaction of coumarin photodimers via a two-photon process using pulsed frequency-doubled Nd:YAG-laser light. The two-photon-induced cycloreversion reaction leads selectively to the cleavage of the coumarin photodimers resulting in the formation of monomeric coumarin molecules. The two-photon cross section of the coumarin photodimer was determined to be of 1.6 x 10(-52) cm(4) s photon(-1). The presented reaction is of interest, e.g., for the photo-triggered release of chemicals in areas which cannot be directly optically addressed due to cover layers which have a high absorption at the single-photon-absorption wavelength. (C) 2003 Elsevier Science B.V. All rights reserved.
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