Rapid solvent-induced recombination and slow energy relaxation in a simple chemical reaction

Picosecond studies of iodine photodissociation in CCl4

M. Berg, Alex Harris, C. B. Harris

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The time scale for solvent ''caging'' in the classic I2 photodissociation reaction appears to be ≤15 ps, on the basis of examination of new picosecond absorption spectra. The previously observed slow recovery (>100 ps) of molecular absorption is shown to be due to both ground-state vibrational relaxation and excited-state trapping in the recombined molecule. In addition, newly observed absorptions in the 350-400-nm region provide direct information on solvent-induced predissociation and excited-state vibrational relaxation.

Original languageEnglish
Pages (from-to)951-954
Number of pages4
JournalPhysical Review Letters
Volume54
Issue number9
DOIs
Publication statusPublished - 1985

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molecular relaxation
photodissociation
iodine
chemical reactions
molecular absorption
excitation
examination
recovery
trapping
absorption spectra
ground state
energy
molecules

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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AB - The time scale for solvent ''caging'' in the classic I2 photodissociation reaction appears to be ≤15 ps, on the basis of examination of new picosecond absorption spectra. The previously observed slow recovery (>100 ps) of molecular absorption is shown to be due to both ground-state vibrational relaxation and excited-state trapping in the recombined molecule. In addition, newly observed absorptions in the 350-400-nm region provide direct information on solvent-induced predissociation and excited-state vibrational relaxation.

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