Coherent Picosecond Exciton Dynamics in a Photosynthetic Reaction Center

Research output: Contribution to journalArticle

Standard

Coherent Picosecond Exciton Dynamics in a Photosynthetic Reaction Center. / Westenhoff, Sebastian; Palecek, David; Edlund, Petra; Smith, Philip; Zigmantas, Donatas.

In: Journal of the American Chemical Society, Vol. 134, No. 40, 2012, p. 16484-16487.

Research output: Contribution to journalArticle

Harvard

APA

CBE

MLA

Vancouver

Author

Westenhoff, Sebastian ; Palecek, David ; Edlund, Petra ; Smith, Philip ; Zigmantas, Donatas. / Coherent Picosecond Exciton Dynamics in a Photosynthetic Reaction Center. In: Journal of the American Chemical Society. 2012 ; Vol. 134, No. 40. pp. 16484-16487.

RIS

TY - JOUR

T1 - Coherent Picosecond Exciton Dynamics in a Photosynthetic Reaction Center

AU - Westenhoff, Sebastian

AU - Palecek, David

AU - Edlund, Petra

AU - Smith, Philip

AU - Zigmantas, Donatas

N1 - The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)

PY - 2012

Y1 - 2012

N2 - Photosynthetic reaction centers convert sunlight into a transmembrane electrochemical potential difference, providing chemical energy to almost all life on earth. Light energy is efficiently transferred through chromophore cofactors to the sites, where charge separation occurs. We applied two-dimensional electronic spectroscopy to assess the role of coherences in the photoresponse of the bacterial reaction center of Rhodobacter sphaeroides. By controlling the polarization of the laser beams, we were able to assign unambiguously the oscillatory dynamics to electronic (intermolecular) coherences. The data show that these coherences are sustained for more than 1 ps, indicating that the protein coherently retains some excitation energy on this time scale. Our finding provides a mechanism for effective delocalization of the excitations on the picosecond time scale by electronic coherence, setting the stage for efficient charge separation.

AB - Photosynthetic reaction centers convert sunlight into a transmembrane electrochemical potential difference, providing chemical energy to almost all life on earth. Light energy is efficiently transferred through chromophore cofactors to the sites, where charge separation occurs. We applied two-dimensional electronic spectroscopy to assess the role of coherences in the photoresponse of the bacterial reaction center of Rhodobacter sphaeroides. By controlling the polarization of the laser beams, we were able to assign unambiguously the oscillatory dynamics to electronic (intermolecular) coherences. The data show that these coherences are sustained for more than 1 ps, indicating that the protein coherently retains some excitation energy on this time scale. Our finding provides a mechanism for effective delocalization of the excitations on the picosecond time scale by electronic coherence, setting the stage for efficient charge separation.

U2 - 10.1021/ja3065478

DO - 10.1021/ja3065478

M3 - Article

C2 - 23009768

VL - 134

SP - 16484

EP - 16487

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 1520-5126

IS - 40

ER -