Time-domain magnetic resonance studies of short-lived radical pairs in liquid solution

Michael R Wasielewski, James R. Norris, Michael K. Bowman

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Magnetic resonance spectra of radical-ion pairs possessing lifetimes as short as 12 ns have been obtained using a new time-resolved optically detected magnetic resonance technique. Short-lived radical pairs are produced by a laser flash. The transient optical absorbance of the radical pairs or the triplet products resulting from their collapse is monitored as a function of time in the presence of high-power 9.1 GHz radiation as a magnetic field is swept. At resonance the microwaves induce transitions among the radical-pair energy levels that are observed as changes in the population of either the radical pair or the triplet products resulting from radical-pair collapse. These resonances can be used to obtain radical-pair structure and dynamics. Radical-ion pairs produced in the reaction-centre protein from the photosynthetic bacterium R. sphaeroides and radical-ion pairs resulting from the photoreduction of anthracene by N,N-diethylaniline in acetonitrile are discussed. All experiments are performed at ambient temperature in liquid solution.

Original languageEnglish
Pages (from-to)279-288
Number of pages10
JournalFaraday Discussions of the Chemical Society
Volume78
DOIs
Publication statusPublished - 1984

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Magnetic resonance
magnetic resonance
Ions
Liquids
liquids
Electron transitions
Electron energy levels
Bacteria
Microwaves
Magnetic fields
Radiation
Lasers
ions
Proteins
Experiments
products
anthracene
photochemical reactions
Temperature
bacteria

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Time-domain magnetic resonance studies of short-lived radical pairs in liquid solution. / Wasielewski, Michael R; Norris, James R.; Bowman, Michael K.

In: Faraday Discussions of the Chemical Society, Vol. 78, 1984, p. 279-288.

Research output: Contribution to journalArticle

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