title: Fluorescence of native and carotenoid-depleted LH2 from Chromatium minutissimum, originating from simultaneous two-photon absorption in the spectral range of the presumed (optically 'dark') S(1) state of carotenoids.
abstract: Native and carotenoid-depleted peripheral purple bacterial light-harvesting complex (LH2) were investigated by simultaneous two-photon excited (between 1300-1500 nm) fluorescence (TPF). TPF results from direct bacteriochlorophyll excitation in both samples. The spectral position of the 2A(g)(-) state of rhodopin [corrected] is indicated by a diminuition of the bacteriochlorophyll TPF in native LH2. In conclusion, comparison to carotenoid-depleted samples is a conditio sine qua non for unambiguous interpretation of similar experiments.
authors.affiliation: Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2a, D-12489 Berlin, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Krikunova
authors.forename: A
authors.initials: A
authors.lastname: Kummrow
authors.forename: B
authors.initials: B
authors.lastname: Voigt
authors.forename: M
authors.initials: M
authors.lastname: Rini
authors.forename: H
authors.initials: H
authors.lastname: Lokstein
authors.forename: A
authors.initials: A
authors.lastname: Moskalenko
authors.forename: H
authors.initials: H
authors.lastname: Scheer
authors.forename: A
authors.initials: A
authors.lastname: Razjivin
authors.forename: D
authors.initials: D
authors.lastname: Leupold
mesh_terms: D001429:Bacteriochlorophylls / Q000737:chemistry; D002338:Carotenoids / Q000737:chemistry* / Q000302:isolation & purification; D002844:Chromatium / Q000737:chemistry*; D004735:Energy Transfer; D045342:Light-Harvesting Protein Complexes; D017785:Photons; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry*; D012243:Rhodopsin / Q000737:chemistry; D013050:Spectrometry, Fluorescence
chemical_list: D001429:Bacteriochlorophylls; D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins; D002338:Carotenoids; D012243:Rhodopsin