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ID:54091817
大小:2.20 MB
页数:50页
时间:2020-04-28
《现代分子荧光检测技术及应用 [兼容模式].pdf》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、1现代分子荧光检测技术及应用王兰芬博士市场部分子光谱工程师18/02/20142荧光现象的发现•1845年,英国的弗雷德里希等人首次观察到奎宁的蓝色450nm的发光(荧光).YellowglassofwineEmfilter>400nmBlueglassQuinineFilter<400nmSolution3发光类型PhenomenonMdfModeofexcitittiationPhotoluminescence(fluorescence,Absorptionoflight(photons)phosphorescence)(光致发光)Radioluminescence(辐射发光)Io
2、nizingradiation(X-rays)Cathodoluminescence(阳极辐射发光)Cathoderays(electronbeams)Electroluminescence(电致发光)ElectricfieldThermoluminescence(热致发光)Heatingafterpriorstorageofenergy(e.g.radioactiveirraditidiation)Chemiluminescence(化学发光)Chemicalprocess(e.g.oxidation)Bioluminescence(生物发光)Biochemical
3、processTriboluminescence(摩擦发光)FrictionalandelectrostaticforcesSonoluminescence(超声发光)Ultrasounds4荧光的发展史•1853(GGStokesG.G.Stokes)提出荧光概念•1858(E.Becquerel)首次观察到磷光•1867(F.Goppelsröder)荧光分析铝-桑色素复合物测定铝离子•1888(EE.WidWiedemann)提出发光概念•1926(F.Perrin)荧光偏振理论•1926(Gaviola)第一台荧光寿命测量仪器(相调制原理)•1935(A.Jablonski):
4、雅布隆斯基能级图(Jablonski’sdiagram)•…5荧光的产生机理AbsorptionrsioneSexcitedstate2ylConvgaInternenerSexcitdttitedstate1FluorescenceNonradiativedissipationGroundStateGroundStateElectrons6磷光的产生机理AbsorptionergyS2ICceennsorbabAIntersystemCrossingS1T1PhosphorescenceGroundStateElectrons7JablonskiJablonskiDiagramDia
5、gram2S120A=PhotonabsorptionF=FlouresceneICT=PhosphoresceneS1S=ElectrongroupstateT02S=ElectronfirstVR1ISC210ICexcitationsingletTstate1VRS=ElectronsecondEnergy2excitdiitedsinglltttetstateT=Electronfirst1AAFTexcitedtripletstateT=Electronsecond=Electronsecond2excitationtripletstate2IC=Internalconver
6、sionIC=InternalconversionS1ISC=Intersystem00Absorption:10-15SconversioInternalconversionandvibrationalrelaxation:10Internalconversionandvibrationalrelaxation:10VRVRvibration-14=-vibration10-11SrelaxtionFluorescene:10-9-10-6S,nsorderPhosphorescene:10-3-10-2S8荧光技术中的几个基本概念荧光发射谱、激发谱、三维荧光谱量子产率荧光寿命:
7、斯托克斯位移(StokesshifStokesshift)同步谱三维光谱内滤效应(Innerfiltereffect)荧光各向异性和偏振(Anisotropyandpolarization):randP荧光淬灭FRETFRAP9荧光发射谱和激发谱ytexcitationemissionensitInWlhWavelengthexcitation:固定发射波长,激发波长扫描,观察物质发光特性的激发光依赖性emission:固定激发波长,
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