title: Ultrafast E to Z photoisomerization dynamics of the Cph1 phytochrome.
abstract: Femtosecond photodynamics of the reverse (15EPfr→15ZPr) reaction of the red/far-red phytochrome Cph1 fromSynechocystiswere resolved with visible broadband transient absorption spectroscopy. Multi-phasic dynamics were resolved and separated via global target analysis into a fast-decaying (260 fs) excited-state population that bifurcates to generate the isomerized Lumi-F primary photoproduct and a non-isomerizing vibrationally excited ground state that relaxes back into the15EPfrground state on a 2.8-ps time scale. Relaxation on a 1-ms timescale results in the loss of red absorbing region, but not blue region, of Lumi-F, which indicates that formation of15ZProccurs on slower timescales.
authors.affiliation: Department of Chemistry, One Shields Ave, University of California, Davis, CA 95616, United States.
authors.forename: Peter W
authors.initials: PW
authors.lastname: Kim
authors.forename: Jie
authors.initials: J
authors.lastname: Pan
authors.forename: Nathan C
authors.initials: NC
authors.lastname: Rockwell
authors.forename: Che-Wei
authors.initials: CW
authors.lastname: Chang
authors.forename: Keenan C
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authors.lastname: Taylor
authors.forename: J Clark
authors.initials: JC
authors.lastname: Lagarias
authors.forename: Delmar S
authors.initials: DS
authors.lastname: Larsen
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