One- And two-color photon echo peak shift studies of photosystem I

Harsha M. Vaswani, Jens Stenger, Petra Fromme, Graham R. Fleming

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Wavelength-dependent one- and two-color photon echo peak shift spectroscopy was performed on the chlorophyll Qy band of trimeric photosystem I from Thermosynechococcus elongatus. Sub-100 fs energy transfer steps were observed in addition to longer time scales previously measured by others. In the main PSI absorption peak (675-700 nm), the peak shift decays more slowly with increasing wavelength, implying that energy transfer between pigments of similar excitation energy is slower for pigments with lower site energies. In the far-red region (715 nm), the decay of the peak shift is more rapid and is complete by 1 ps, a consequence of the strong electron-phonon coupling present in this spectral region. Two-color photon echo peak shift data show strong excitonic coupling between pigments absorbing at 675 nm and those absorbing at 700 nm. The one- and two-color peak shifts were simulated using the previously developed energy transfer model (J. Phys. Chem. B 2002, 106, 10251; Biophysical Journal 2003, 85, 140). The simulations agree well with the experimental data. Two-color photon echo peak shift is shown to be far more sensitive to variations in the molecular Hamiltonian than one-color photon echo peak shift spectroscopy.

Original languageEnglish (US)
Pages (from-to)26303-26312
Number of pages10
JournalJournal of Physical Chemistry B
Volume110
Issue number51
DOIs
StatePublished - Dec 28 2006

Fingerprint

Photosystem I Protein Complex
echoes
Photons
Color
color
shift
photons
Pigments
Energy transfer
pigments
energy transfer
Spectroscopy
Hamiltonians
Wavelength
Excitation energy
Chlorophyll
chlorophylls
decay
wavelengths
spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

One- And two-color photon echo peak shift studies of photosystem I. / Vaswani, Harsha M.; Stenger, Jens; Fromme, Petra; Fleming, Graham R.

In: Journal of Physical Chemistry B, Vol. 110, No. 51, 28.12.2006, p. 26303-26312.

Research output: Contribution to journalArticle

Vaswani, Harsha M. ; Stenger, Jens ; Fromme, Petra ; Fleming, Graham R. / One- And two-color photon echo peak shift studies of photosystem I. In: Journal of Physical Chemistry B. 2006 ; Vol. 110, No. 51. pp. 26303-26312.
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