Borgis, Daniel and Rossky, Peter and Turi, László (2007) Nuclear quantum effects on the nonadiabatic decay mechanism of an excited hydrated electron. Journal of Chemical Physics, 127 (17). p. 174508. ISSN ISSN 10897690

PDF
MS_repository_JCP_2007_127_174508.pdf Download (252kB) 
Abstract
We present a kinetic analysis of the nonadiabatic decay mechanism of an excited state hydrated electron to the ground state. The theoretical treatment is based on a quantized, gap dependent golden rule rate constant formula which describes the nonadiabatic transition rate between two quantum states. The rate formula is expressed in terms of quantum time correlation functions of the energy gap, and of the nonadiabatic coupling. These gap dependent quantities are evaluated from three different sets of mixed quantumclassical molecular dynamics simulations of a hydrated electron equilibrated a) in its ground state, b) in its first excited state, and c) on a hypothetical mixed potential energy surface which is the average of the ground and the first excited electronic states. The quantized, gapdependent rate results are applied in a phenomenological kinetic equation which provides the survival probability function of the excited state electron. Although the lifetime of the equilibrated excited state electron is computed to be very short (well under 100 fs), the survival probability function for the nonequilibrium process in pumpprobe experiments yields an effective excited state lifetime of around 300 fs, a value consistent with the findings of several experimental groups and previous theoretical estimates.
Item Type:  Article 

Subjects:  Q Science / természettudomány > QD Chemistry / kémia > QD02 Physical chemistry / fizikai kémia 
Depositing User:  Dr. Túri László 
Date Deposited:  04 May 2012 05:20 
Last Modified:  05 Sep 2012 09:21 
URI:  http://real.mtak.hu/id/eprint/2954 
Actions (login required)
Edit Item 