现代仪器分析SFG.ppt

1、applicationofsumfrequencygenerationvibrationalspectroscopyincharacteringpolymersurface聚合物的表面和界面的特征和频率振动光谱，reporter:tanjiaoj 、主要和人员of SFG、简单规格体系(5主单元)、外观、单层无大片。 创新行业，环境响应，混合行业，多边形角色，高级，SFG，行业。 2 .清洁表面(样本(b ) fmma=0. 06。 (C)fMMA=0.09 (D)fMMA=0.11 .3 .结构安全保护/PMMA混合， figurewatercontact-angleofblendsbefo

2、re figuresfgofblends.sampleswereannealedinavacuumat 150 for 20 h，伊柳， Marie c.messer.j.phys.chem.b.3 .结构安装策略/PMMA品牌，4 .环境响应， sfghavebeenusedsuccessfullytoprobeburiedinterfacinvariousfieldsofresearch.buttherearemanyprolemstobesolved :1.irirved ctrol pectroscopymolecularchirality3. developmentofhigh-po

3、wertuneablelasersources、Thank you -TJJ、原理、 IR -可视sumfrequencygenerationspectroscopyusestwolaserbeamsthatoverlapatasurfaceofamaterialortheinterfacebetweentwomaterri atafrequencyofthesumofthetwoinputbeams.thetwoinputbeamshavetobeabletoaccessthesurface。 andtheoutputbeamneedstobeabletoleavethesurfacetob

4、epickedupbyadetector.2 oneofthebeamsisavisiblewavelengthlaserheldatacons验证书thesystemcanscanoverresonancesandobtainthevibrationalspectrumoftheinterfacialregion.1 asanonlinearopticalprocess。 thepolarizationwhichgeneratestheoutputdependsontheelectricfieldsofthetwoinputbeams.asasecond-ordernonlinearproc

5、ess。 sfgisdependentonthe2ndordersusceptibility (2).thefactthatthe2ndordersusceptibility，a third秩检测器。 becomeszeroincentrosymmetricmedia，limitswhatsamplesareaccessibleforsfg.centrosymmetricmediaincludethebulkofgases， limitswhatsamplesareaccessibleforsfg.Centro andmostsolidsundertheassumptionoftheelect

6、ric -双极应用程序。 whichneglectsthesignalgeneratedbymultipolesandmagneticmoments.2 ataninterfacebetweentwodifferentmaterialsortwocentrosymmetro the enandansfgsignalcanbegenerated.thissuggeststhattheresultingspectrarepresentathinlayerofmolecules ignalisfoundwhenthereisanetpo sumfrequencygenerationspectrosc

7、opy (SFG ) isatechniqueusedtoanalyzesurfacesandinterfaces.thisnonlinearlaserspectroscopymethodwasdevelopedin 1987 andrapidlyappliedtodeeed 定向分布、andsomestructuralinformationofmoleculesatgassolid、gasliquidandliquidsolidinterfaces.inatypicalsfgs twolaserbeamsmixatasurfaceandgenerateanoutputbeamwithafrequencyequaltothesumofthetwoinputfrequencies.sfghasadvantagesinits ABI ensitive、ab