title: Photoreduction kinetics of sodium tetrachloroaurate under synchrotron soft X-ray exposure.
abstract: We report on the time evolution of the sodium tetrachloroaurate (NaAuCl(4)) chemical properties as a function of soft X-ray exposure in a dried sample on a silicon surface using X-ray photoelectron spectroscopy (XPS). Our investigations provide mechanistic insight into the photoreduction kinetics from Au(III) to Au(I) and then Au(I) to Au(0). We unambiguously show that XPS photoreduction occurs in stepwise fashion via the Au(I) state. Both photoreduction steps undergo first-order kinetics.
authors.affiliation: Department of Chemistry, The University of Adelaide, Adelaide, SA 5005, Australia.
authors.forename: Yuen-Yan
authors.initials: YY
authors.lastname: Fong
authors.forename: Bradley R
authors.initials: BR
authors.lastname: Visser
authors.forename: Jason R
authors.initials: JR
authors.lastname: Gascooke
authors.forename: Bruce C C
authors.initials: BC
authors.lastname: Cowie
authors.forename: Lars
authors.initials: L
authors.lastname: Thomsen
authors.forename: Gregory F
authors.initials: GF
authors.lastname: Metha
authors.forename: Mark A
authors.initials: MA
authors.lastname: Buntine
authors.forename: Hugh H
authors.initials: HH
authors.lastname: Harris
mesh_terms: D002712:Chlorides / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D017612:Gold Compounds / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D010777:Photochemistry; D012825:Silicon / Q000737:chemistry; D013053:Spectrophotometry; D013499:Surface Properties; D017356:Synchrotrons; D014965:X-Rays
chemical_list: D002712:Chlorides; D017612:Gold Compounds; D006046:Gold; C024568:gold tetrachloride, acid; D012825:Silicon