Energy transfer and trapping in Photosystem II core particles with closed reaction centers

J. P.M. Schelvis, M. Germano, T. J. Aartsma, H. J. van Gorkom

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Picosecond absorbance changes in the Qy absorption region were measured on Photosystem II core particles with closed reaction centers by the one-color pump-probe method. The induced absorption changes are well described by three components with lifetimes of 21 ± 6 ps, 80 to 200 ps and 1.5 ns, in addition to a non-decaying component. The 1.5 ns lifetime component is assigned to recombination of the primary radical pair in equilibrium with the excited state. Since the lifetime of the intermediate component depends on the excitation wavelength and its spectrum differs from that of the 21 ps component, a rapid equilibration of the excitations over the whole antenna is excluded. The 21 ps and the intermediate component are discussed in terms of energy transfer and trapping processes.

Original languageEnglish
Pages (from-to)165-169
Number of pages5
JournalBBA - Bioenergetics
Volume1230
Issue number3
DOIs
StatePublished - 30 Jun 1995

Keywords

  • Core complex
  • Energy transfer
  • Long-wavelength pigment
  • Photosystem II
  • Picosecond transient absorption
  • Trapping

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