title: Instantaneous mapping of coherently coupled electronic transitions and energy transfers in a photosynthetic complex using angle-resolved coherent optical wave-mixing.
abstract: Understanding the role of coherent electronic motion is expected to resolve general questions of importance in macromolecular energy transfer. We demonstrate a novel nonlinear optical method, angle-resolved coherent wave mixing, that separates out coherently coupled electronic transitions and energy transfers in an instantaneous two-dimensional mapping. Angular resolution of the signal is achieved by using millimeter laser beam waists at the sample and by signal relay to the far field; for this we use a high energy, ultrabroadband hollow fiber laser source. We reveal quantum electronic beating with a time-ordered selection of transition energies in a photosynthetic complex.
authors.affiliation: School of Physics, Centre for Synthesis and Chemical Biology, University College Dublin, Dublin 4, Ireland.
authors.forename: Ian P
authors.initials: IP
authors.lastname: Mercer
authors.forename: Yasin C
authors.initials: YC
authors.lastname: El-Taha
authors.forename: Nathaniel
authors.initials: N
authors.lastname: Kajumba
authors.forename: Jonathan P
authors.initials: JP
authors.lastname: Marangos
authors.forename: John W G
authors.initials: JW
authors.lastname: Tisch
authors.forename: Mads
authors.initials: M
authors.lastname: Gabrielsen
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Cogdell
authors.forename: Emma
authors.initials: E
authors.lastname: Springate
authors.forename: Edmund
authors.initials: E
authors.lastname: Turcu
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry*; D045342:Light-Harvesting Protein Complexes / Q000737:chemistry*; D017711:Nonlinear Dynamics; D055095:Optics and Photonics / Q000295:instrumentation / Q000379:methods*; D010788:Photosynthesis; D011789:Quantum Theory
chemical_list: C081521:B800-850 light-harvesting complex, bacteria; D001426:Bacterial Proteins; D045342:Light-Harvesting Protein Complexes