c3em00573a
- 岁月如歌
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2019-03-31 21:53:22
文档简介：
c3em00573aTheimportanceofcharge-transferinteractionsindeterminingchromophoricdissolvedorganicmatter(CDOM)opticalandphotochemicalpropertiesCharlesM.Sharpless*aandNeilV.Blough*bAbsorptionofsunlightbychromophoricdissolvednaturalorganicmatter(CDOM)isenvironmentallysignificantbecauseitcontrolsphoticzonedepthandcausesphotochemistrythataffectselementalcyclingandcontaminantfate.Boththeoptics(absorbanceandfluorescence)andphotochemistryofCDOMdisplayunusualpropertiesthatcannoteasilybeascribedtoasuperpositionofindividualchromophores.Theseinclude(i)broad,unstructuredabsorbancethatdecreasesmonotonicallywellintothevisibleandnearIR,(ii)fluorescenceemissionspectrathatallfallintoasingleenveloperegardlessoftheexcitationwavelength,and(iii)photobleachingandphotochemicalquantumyieldsthatdecreasemonotonicallywithincreasingwavelength.Incontrasttoasimplesuperpositionmodel,thesephenomenaandotherscanbereasonablywellexplainedbyaphysicalmodelinwhichcharge-transferinteractionsbetweenelectrondonatingandacceptingchro
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