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The assignment of Qy(1,0) vibrational structure and Qx for chlorophyll a

Hughes, Joseph; Conlan, Brendon; Wydrzynski, Thomas; Krausz, Elmars

Description

We used non-photochemical persistent spectral hole-burning at 1.4 K to investigate the Qy(1,0) vibrational structure of Chl a in a water-soluble chlorophyll-binding protein (WSCP) which exhibits resolved structure in its broadband optical spectra. Franck-Condon vibrational overlap factors were determined from the vibrational hole-burning data and used to simulate the Qy(1,0) spectra. The simulations were not able to accurately reproduce the details of the Qy(1,0) spectrum. This indicates a...[Show more]

dc.contributor.authorHughes, Joseph
dc.contributor.authorConlan, Brendon
dc.contributor.authorWydrzynski, Thomas
dc.contributor.authorKrausz, Elmars
dc.date.accessioned2015-12-10T22:50:57Z
dc.identifier.issn1875-3892
dc.identifier.urihttp://hdl.handle.net/1885/58828
dc.description.abstractWe used non-photochemical persistent spectral hole-burning at 1.4 K to investigate the Qy(1,0) vibrational structure of Chl a in a water-soluble chlorophyll-binding protein (WSCP) which exhibits resolved structure in its broadband optical spectra. Franck-Condon vibrational overlap factors were determined from the vibrational hole-burning data and used to simulate the Qy(1,0) spectra. The simulations were not able to accurately reproduce the details of the Qy(1,0) spectrum. This indicates a breakdown of the approximations used for the analysis and demonstrates that vibrationally induced mixing of electronic states (vibronic coupling) is active for Chl a. By considering the inhomogeneous broadening and vibrational hole-burning phenomena in the Qx and Qy(1,0) region of Chl-WSCP in addition to magnetic circular dichroism data, we favor the traditional placement of Qx at λ∼570-590 nm rather than the alternate assignment underneath the Qy(1,0) absorption near λ∼615-630 nm.
dc.publisherElsevier
dc.sourcePhysics Procedia
dc.subjectKeywords: Binding proteins; Chlorophyll a; Franck-Condon; Franck-Condon factors; Hole burning; Inhomogeneous broadening; Magnetic circular dichroisms; Optical spectra; Persistent spectral hole burning; Vibrational structures; Vibronic coupling; Dichroism; Porphyrin Franck-condon factor; Hole-burning; Inhomogeneous width; Vibronic; WSCP
dc.titleThe assignment of Qy(1,0) vibrational structure and Qx for chlorophyll a
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume3
dc.date.issued2010
local.identifier.absfor029901 - Biological Physics
local.identifier.ariespublicationu4217927xPUB460
local.type.statusPublished Version
local.contributor.affiliationHughes, Joseph, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationConlan, Brendon, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationWydrzynski, Thomas, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationKrausz, Elmars, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage1591
local.bibliographicCitation.lastpage1599
local.identifier.doi10.1016/j.phpro.2010.01.226
local.identifier.absseo970103 - Expanding Knowledge in the Chemical Sciences
dc.date.updated2016-02-24T10:43:42Z
local.identifier.scopusID2-s2.0-77951553290
CollectionsANU Research Publications

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