Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
Two-photon induced exciton mediated dissociation of N20 and photomobility of 0 atoms in crystalline Xe
 

Summary: Two-photon induced exciton mediated dissociation of N20
and photomobility of 0 atoms in crystalline Xe
W. G. Lawrence and V. A. Apkariana)
Department of Chemistry, University of California, Irvine, California 92717
(Received 7 May 1992; accepted 24 July 1992)
Two-photon induced access of Xe excitons at 248 nm leads to efficient dissociation of N20
impurities via ionic potentials. The product 0 atoms are probed via the Xe+O- charge trans-
fer transitions, and the N,O disappearance is probed by infrared (IR) spectroscopy. Charge
transfer excitation of 0 atoms leads to atomic mobility, such that with extensive irradiation a
photochemical steady-state is reached between NzO, oxygen atoms trapped in the Xe bulk,
and within the same cage as N,. A detailed kinetic analysis of these processes is presented.
Among the extracted parameters are the two-photon absorption cross section of Xe at 248
nm, 3.7X 10m4* cm4 s, the free exciton migration length, 47 A, and the excitonic dissociation
probability of N,O, 0.85. The mobility of photoexcited 0 atoms is attributed to the topology
of electronically excited surfaces which show minima at the ground state cage barriers.
1. INTRODUCTION
Photodissociation studies of molecules trapped in rare
gas solids often involve intense ultraviolet laser irradiation
of highly diluted samples. Under such conditions, the pri-
mary irradiation energy may be predominantly deposited

  

Source: Apkarian, V. Ara - Department of Chemistry, University of California, Irvine

 

Collections: Chemistry