DesigningYwMakingwandwTestingwSamplewHolderwforwElectronwParamagneticwResonance

NanazShumiya’zJessicazClayton’zMarkzSherwinUCSBzPhysicszDepartment’zInstitutezForzTerahertzzSciencezandzTechnology

ElectronwParamagneticwResonance

Problems

ElectronzparamagneticzresonancezbEPRvziszazspectroscopicztoolztozstudyzmaterialzwithzunpairedzelectronszandziszusedzinzPhysics’zMaterialzScience’zChemistryzandzBiologyxzItzallowsztozobservezvariouszpropertieszofzmaterialszbyzobservingzthezbehaviorzandzlocalzenvironmentzofzelectronsx

Generally’zeachzlight’szfrequencyzcorrespondztozazspecificzexternalzmagneticzfieldzinztermszofzenergyxzEPRzworkszbyzshiningzfixedzfrequencyzEMzradiationzwhilezsweepingzexternalzmagneticzfieldz

zz

However’zEPRzdoesznotzalwayszshowzazreliablezsignalxzAlthoughzEPRzarezexpectedztozdetectzonlyzemittedzlight’zitzalsozhappensztozdetectzthezreflectedzlightzpassingzthroughzthezsample’zandzsomezspuriouszeffectszoccurszbecausezofzthiszlightxzThezdetectedzradiationzacquirezsomezphasezaszitzpasseszthroughzthezsamplezbeforezbeingzmeasuredzbyzthezdetectorxzInzaddition’zlargezvolumezsampleszorzsampleszwithzazhighzconcentrationzofzspinszarezsusceptibleztozrefractivezbroadening’zwhichzcanzartificiallyzchangezthezsignalxzThezgoalzofzthiszsummerzwaszdesigning’zmakingzandztestingznewzsamplezholderzgeometriesztozminimizezthesezeffectsxzz

DesigningwandwMaking

FirstzstepzwaszdesigningznewzsamplezholderzshapeszusingzODzdesigningzsoftware’zSolidWorksxzIzdesignedzazstandardzsamplezholderzshapezandzthreeznewzsamplezholderzshapezaszbelowxz

WithzStandardzShape’zspuriouszeffectszarezcausedzbyzperpendicularlyzreflectedzlightzonzthezflatzbottomxzInzorderztozavoidzthosezreflection’znewzsamplezholderszwerezmadeztozreflectzlightzintozdifferentzdirectionszandzletzdetectorzonlyzreadzemittedzlightxz Oncezthezdesingnigzwaszcompleted’z

samplezholderzwerezmadezfromzteflonzrodzusingzazLathezfollowingzthezdesignzatzUCSBzPhysicszmachinezshopxWithzthezcreatedzsamplezholder’zIztookzmeasurementszwithzEPRzandzcomparedzdatax

TeflonwRod

Lathe

SamplewHolder

Whenzlookingzatzsignalzdata’zthezperformancezwaszjudgedzbasedzonztwozcriteriaxzOneziszhighzamplitudezwithzlowznoise’zandzthezotherzonezisznozdistortionzfromztheoreticalzlineshapexNotezthatzthezdatazmisseszConezUpzShapezbecausezIzwaszunableztozcompletezthezmeasumentzwithzConezUpzShapezdueztozhardwarezproblemsxz

intozsamplezmaterialxzByzdetectingzreflectedzEMzradiationzandzshowingzitzaszazsignal’zEPRzallowsztozobservezthezbehaviorzandzlocalzenvironmentzofzelectronsxz

Withzlowzpowerzlight’zConezDownzShapezgavezthezbestzlineshapezoutzofzthezthreezsamplezholderxzAdditionally’zConezDownzShapezgavezthezhighestzamplitudexzTherefore’zIzconcludedzthatzConezDownzShapezgavezthezbestzsignalzwithzhighzpowerzlightx

NormalizedwSignalwDatawwithwLowwPowerwLight

TheoreticalwSignalwofwwww40mMw4!aminowTEMPOwwithwLowwPower

TheoreticalwSignalwof40mMw4!aminowTEMPOwwithwHighwPower

NormalizedwSignalwDatawwithwHighwPowerwLight

Withzhighzpowerzlight’zConezDownzShapezalsozgavezthezhighestzamplitudexzHowever’zConezDownzShapezcausedzanzunexpectedzbumpzaroundz7xj5zT’zwhichzisznotzgoodzlineshapexzOnzthezcontrary’zSlopezShapezgaveznozdistortionzwithzlitttleznoisexzTherefore’zIzconcludedzthatzSlopezShapezgavezthezbestzlineshapezalthoughzConezDownzShapezgavezthezlargestzsignalxz

Sherwin’swGroup’swEPR

MeasurementzwithzLowzPowerzLightzzzzzzzzzz→HighzAmplitude1zConezDownzShapezzzzzzzzzz→BestzLinezshape1zConezDownzShape

MeasurementzwithzHighzPowerzLightzzzzzzzzzz→HighzAmplitude1zConezDownzShapezzzzzzzzzz→BestzLinezshape1zSlopezShape

3xzCompletezthezmeasurementzofzConezUpzShape

WxzFurtherzAnalysiszonzthezmeasumentzresult

OxzUsezODzprinterzforzprecisezcontrolzofzshape

Acknowledment

JessicazClaytonAlisazLeavesleyBlakezWilsonz

ContactzInformation1zNanazShumiyazzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzznshumiya@gmailxcom

Conclusion

LowwPowerwSignal HighwPowerwSignal

Data

FuturewWorks

ThankwYou4

DrxzMarkzSherwinSherwin’szGroupGuyzPattersonz