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Caged spin-orbit excited I*,,2 P1/2... I*,,2
 

Summary: Caged spin-orbit excited I*,,2
P1/2... I*,,2
P1/2... atom pairs in liquids
and in cryogenic matrices: Spectroscopy and dipolar quenching
A. V. Benderskii, R. Zadoyan, and V. A. Apkarian
Department of Chemistry, University of California, Irvine, California 92697-2025
Received 4 April 1997; accepted 18 August 1997
Two-photon excitation of I2 in room temperature liquid solutions and in cryogenic rare gas matrices,
in the 500600 nm range, leads to fluorescence in the near infrared. The emission spectra are
assigned to the I*I*(2
P1/2
2
P1/2)I*I(2
P1/2
2
P3/2) transitions, namely, to contact pairs of spin
excited atoms which are strictly bound by the solvent cage. The spectra are analyzed to characterize
cage potentials and contact distances. In rare gas solids, the caged pair relaxes radiatively, rad
3.9, 3.1, and 2.8 s, in Ar, Kr, and Xe. In room temperature liquids, emission from both geminate
and nongeminate pairs occurs, resulting in bimodal kinetics. The fluorescence yield strongly

  

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

 

Collections: Chemistry