Quantum beats of the radical pair state in photosynthetic models observed by transient electron paramagnetic resonance

K. Laukenmann, S. Weber, G. Kothe, C. Oesterle, A. Angerhofer, Michael R Wasielewski, W. A. Svec, J. R. Norris

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Abstract

Time-resolved electron paramagnetic resonance (EPR) is used to study the transient spin polarization behavior of the light-induced radical pair state in the photosynthetic model system 2-tetraalkylphenylenediamine-Zn porphyrin-2-naphthoquinone. The time evolution of the transverse magnetization is monitored at various static magnetic fields. This implies a two-dimensional variation of the signal intensity with respect to both the magnetic field and time axis. Zero quantum coherence between two of the four eigenstates of the radical pair is observed at early times after the laser pulse. The beat frequencies vary significantly with the static magnetic field and extend up to 70 MHz. This model system is the first example where quantum beats have been observed of a correlated radical pair with protonated constituents.

Original languageEnglish
Pages (from-to)4324-4329
Number of pages6
JournalJournal of Physical Chemistry
Volume99
Issue number12
Publication statusPublished - Jan 1 1995

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ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

Laukenmann, K., Weber, S., Kothe, G., Oesterle, C., Angerhofer, A., Wasielewski, M. R., ... Norris, J. R. (1995). Quantum beats of the radical pair state in photosynthetic models observed by transient electron paramagnetic resonance. Journal of Physical Chemistry, 99(12), 4324-4329.