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Picosecond Time‐Resolved Dispersion Spectroscopy Using the Interference between Population and Thermal Phase Gratings
Author(s) -
Högemann Claudia,
Vauthey Eric
Publication year - 1998
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.199800020
Subject(s) - chemistry , grating , picosecond , dispersion (optics) , population , spectroscopy , optics , phase (matter) , molecular physics , analytical chemistry (journal) , laser , physics , demography , organic chemistry , chromatography , quantum mechanics , sociology
A new method is presented for measuring directly the dispersion spectrum of short‐lived transients, based on heterodyne transient grating spectroscopy. The light diffracted from a preformed thermal phase grating is used as a local oscillator, in phase with the light diffracted from the population phase grating. Time‐resolved dispersion spectra measured upon photoinduced electron transfer reaction between 9,10‐dicyano‐anthracene and anisole in acetonitrile are presented. These spectra and the corresponding absorption spectra obtained by Kramers‐Kronig transformation are compared with those deduced from the homodyne transient grating spectra. Potential applications of this technique are discussed.