Flash photolysis picosecond

Picosecond flash photolysis of DAR (see Scheme 12.1) allowed the direct measurement of Tx as 0.4 ns (cyclohexane) and 0.2 ns (acetonitrile.) The lowest triplet ,7i state of DAR undergoes crossing with the O.O state of the forming radicals. Many Pis (Table 12.1) demonstrate an unusual performance the rate constant of S i-T intersystem crossing is lower than diss- There is no experimental evidence so far that Pis (Table 12.1) dissociate in the Si state. ... 

Yoshihara, K., Namiki, A., Sumitani, M., Nakashima, N., Picosecond Flash Photolysis of cis and trans Stilbene. Observation of an Intense Intramolecular Charge Resonance Transition, J. Chem. Phys. 1979, 71, 2892 2895. 

It is clear from the first report of the application of picosecond flash photolysis to the study of porphyrin photophysics that this technique will become increasingly important.349 Thus it has been found possible to record the absorption spectra of both the singlet state (r 500 ps) and triplet states of (OEP)SnCl2. Further, could be measured, and the value differed from that found by previous workers. For (OEP)Pd both singlet and triplet states could be observed, whereas only one species was found for the paramagnetic (OEP)Cu and (TPP)Cu complexes. Nanosecond laser flash photolysis has been used in the study of the transients formed from Cu11 and Pbn porphyrins.360 No observable intermediates were detected for the Agn, Nin, and Co111 derivatives. Triplet-triplet absorption spectra of a series of porphyrins and their Zn complexes have been recorded.361... 

Department of Chemistry and Canadian Center for Picosecond Flash Photolysis, Concordia University, Montreal, Quebec, Canada CNRS Laboratoire de Chimie Physique A, Universite de Bordeaux 1,33405 Talence... 

Krysanov SA, Alfimov MV (1984) Picosecond flash photolysis of photochromic spiropyrans. Laser Chem 4 129-138... 

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