spectra of pure liquids：纯液体的光谱

《spectra of pure liquids：纯液体的光谱》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。

1、ScienceinMotionJuniataCollegeInfraredSpectraofPlasticsPAStateStandards:1.2.11.AReadandunderstandthecentralcontentofinformationaltextsanddocumentsinallacademicareas.3.1.10.CApplypatternsasrepeatedprocessesorrecurringelementsinscienceandtechnology.3.4.10.AExplainconceptsaboutthestructureandpropertie

2、sofmatter.3.7.10.BApplyappropriateinstrumentsandapparatustoexamineavarietyofobjectsandprocesses.·Describeanddemonstratetheoperationanduseofadvancedinstrumentationinevaluatingmaterialandchemicalproperties.Introduction:Infrared(IR)lightiselectromagneticradiationwithlowerenergythanvisiblelight.Infrar

3、edlightcanmakebondsvibrate,bend,orstretch.DifferentenergiesofIRradiationarerequiredtomovebondsbasedonthebondstrengthandthemassoftheatomsinvolved.Aspecificgroupingofatomsinamolecule,orafunctionalgroup,willalwaysabsorbthesamelevelofIRenergy.Wavenumbers(inversewavelengths)areusedtomeasurethesediffere

4、ntenergiesofIRradiation.Inthisexperiment,youwillcompareinfraredspectraofplasticsamplestodeterminetheiridentities.ThisIRusesanATRaccessory.ATRstandsforattenuatedtotalreflectance.IRenergyfromalaserisreflectedoffamirror,throughthesample,thenbackdownintotheinstrument.ThisproceduremakestheIRmucheasiert

5、ouse,butitdoesreducepeaksizeconsiderably.Itwillnot,however,changethelocationofthepeaks.GuidingQuestion:Pleaseanswerthefollowingquestionbeforebeginningthelab.Willinfraredspectroscopybesufficienttopositivelyidentifyaplasticsample?Whyorwhynot?Equipment/Materials:InfraredSpectraofPlasticsRevised6/22/0

6、7Page3ScienceinMotionJuniataCollegeFTIRATRaccessoryPlasticsamplesForcepsPrinterPaperMouseMousepadKeyboard(opt.)InfraredSpectraofPlasticsRevised6/22/07Page3ScienceinMotionJuniataCollegeSafety:Alwayswearsafetyglassesinthelab.InfraredSpectraofPlasticsRevised6/22/07Page3ScienceinMotionJuniataCollegePr

7、ocedure:GettingStarted:1.TurnontheFTIRwiththeswitchatthebackleftoftheinstrument.Theinstrumentshouldwarmupforaminimumof15minutes.2.Enteranyusername.(Ex.Student)ClicktheconfigurationPlasticsorPlasticsTransmittance,