Summary: Excited­state reversible geminate reaction. II. Contact geminate quenching
Noam Agmon
The Fritz Haber Research Center, Department of Physical Chemistry, The Hebrew University, Jerusalem
91904, Israel
~Received 4 August 1998; accepted 22 October 1998!
Results of Part I are extended to include the effect of contact quenching by the geminate partner.
The long­time and asymptotic solutions derived herein are compared with numerical and
experimental data for excited­state proton transfer to solvent, involving both quenching and two
different lifetimes. © 1999 American Institute of Physics. @S0021­9606~99!51104­5#
I. INTRODUCTION
A realistic description of the kinetics of excited­state
proton transfer to solvent ~PTTS! involves several simulta­
neous processes. Perhaps most well­studied is the reversibil­
ity of this diffusion­influenced reaction, leading to the t 23/2
asymptotic decay of the initially bound state. 1--6 This shows
that the solvated geminate proton may recombine with the
base adiabatically, in the excited electronic state. At the same
time, the acid and base forms decay to their ground elec­
tronic state. To simplify the problem, it has mostly been
assumed that their excited­state lifetimes are equal. In reality,

Source: Agmon, Noam - Institute of Chemistry, Hebrew University of Jerusalem

Collections: Chemistry