Abstract
Abstract The efficiency of the non-resonant two-photon (NRTP) isomerizations of stilbenes and 1,4-diphenyl-1,3-butadienes were found to depend strongly on the wavelength of the laser pulses. The results not only confirm the 21Ag nature of the excited states responsible for the cis-trans isomerizations but also demonstrate that the action spectra of the NRTP reactions correspond to the two-photon allowed absorption bannds.
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