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Non-Markovian (memory function) chemical kinetics
formalism -Integral Encounter Theory (IET) is a
common approach to study the kinetics of chemical
reaction beyond conventional mass-action formalism.
This work summarizes a general formalism of IET and
its application to study two types of photochemical
reaction systems. For the first application, the
biexcitonic photoionization with short lived (singlet)
excitations , the non-Markovian kinetics derived
from IET was shown to be more accurate and detailed
than its oversimplified Markovian analog. Only for
long lived (triplet) excitations the non-Markovian
and Markovian results are similar, provided that the
rate constants
are properly defined. For the second application,
photooxidation competing with energy quenching was
studied. We obtained the stationary concentration of
the free carriers, with account of their geminate
recombination before separation, as well as the
stationary rate of singlet oxygen generation,
affected by preliminary quenching of nearest
excitations in the course of ionization.
About the author
Oleg Igoshin received his Master degree in Chemical Physics fromWeizmann Institute in 2000 and Ph.D. in Physics from UC Berkeleyin 2004. He is currently an Assistant Professor in BioengineeringDepartment at Rice University, Houston, TX.
