Skip to Content.
Sympa Menu

fizinfo - [Fizinfo] Magneto-optikai Spektroszkópia csoport szemináriuma

fizinfo AT


List archive

[Fizinfo] Magneto-optikai Spektroszkópia csoport szemináriuma

Chronological Thread 
  • From: bordacs.sandor AT
  • To: Fizinfo <Fizinfo AT>
  • Cc: Kezsmark <kezsmark AT>, Jakub Vit <jakub.vit AT>
  • Subject: [Fizinfo] Magneto-optikai Spektroszkópia csoport szemináriuma
  • Date: Mon, 04 Jan 2016 16:10:48 +0100
  • Authentication-results: (amavisd-new); dkim=pass (1024-bit key)

Kedves Kollégák,

Szeretném a figyelmükbe ajánlani az MTA-BME Magneto-optikai Spektroszkópia Lendület csoport következő szemináriumát.

Időpont: 2016. január 8. 14:15
Helyszín: BME, Budafoki út 8. F épület III. lh. Szemináriumi szoba

David Palecek
Department of Chemical Physics, Lund University, Sweden
Department Chemical Physics and Optics, Charles University in Prague

"Quantum Coherence for Light Harvesting"

Two-dimensional electronic spectroscopy has proven to be especially well suited for studying
coupled molecular systems, providing new insights into the population and coherence dynamics.
Multiple ultra short laser pulses are employed to extract maximum possible information about
the system in both time and energy [1]. Amplitude oscillations in the 2D spectra is a direct
evidence of the dynamically evolving superposition states. Interestingly enough, they were
initially interpreted as a purely electronic superposition with a conclusion that excitation
energy can be transferred coherently through the light-harvesting complexes. This finding
stimulated an immense scientific effort to understand the mechanisms of such wave-like energy
transfer [2]. In the case of photosynthetic reaction center, we identified a new photophysical
mechanism of the coherent dynamics; Energy Transfer Induced Coherence Shift (ETICS). In
ETICS mechanism, the initial excited state coherence is shifted to the ground state of the
donor upon energy transfer step without the loss of vibronically mixed character and phase
information. Yet it acquires the picosecond lifetime of the ground state vibrational coherence
[3]. Our results suggest that the hypothesis of the wave-like energy transfer has to be revisited.

[1] Brixner, T. et al. Phase-stabilized two-dimensional electronic spectroscopy. J. Chem. Phys.,
121(9):4221–4236, 2004.
[2] Engel, G. S. et al. Evidence for wavelike energy transfer through quantum coherence in
photosynthetic systems. Nature, 446(7137):782–786, April 2007.
[3] Paleˇcek, D. et al. Quantum coherence as a witness of vibronically hot energy transferin
bacterial reaction centre. In manuscript, 2016


Bordács Sándor

Attachment: palecek_abstract_budapest_1601.pdf
Description: Adobe PDF document

  • [Fizinfo] Magneto-optikai Spektroszkópia csoport szemináriuma, bordacs . sandor, 01/04/2016

Archive powered by MHonArc 2.6.19+.

Top of Page