I题目:核磁共振实验研究摘要本文通过做核磁共振实验和电子自旋共振实验两个实验来研究核磁共振和电子自旋共振实验在改变不同的条件后共振信号变化的情况以及相关量的计算。在核磁共振实验中，我们用内扫法和外扫法来观察氢核在改变不同的条件下的共振信号核磁共振信号变化情况是发现，我们发现在给定一个确定的磁场下，波峰随着边线磁场和频率的变化波峰之间的距离也在跟着变化，但是图像成对称性。随着频率的增大，共振信号图像是向两边移动，相反随着边线磁场的增大，核磁共振信号图出现向中间靠拢的现象。在外扫法下我们发现，在给定的一个确定磁场下，共振信号图像的位置和图像的大小会随着频率和边线磁场的大小改变而改变，图像的大小和波位置都会跟着变化。随着频率的增大，我们会发现共振信号图向右移动，但并没有引起纵向的变化。测得γg氢核和，以及氟的γg和的值。和理论值进行对比，并且分析误差来源。在电子自旋实验中，我们发现随着频率的增大，示波器中波与波之间的间距就会减小，并且中间的波就会想两端开始移动。B0增大时示波器中的波会出现两极分化的情况，中间的波会向中间越来越靠近，直到波重合，波形变高，同样示波器中，两端的波会向两端运动，波形变高。并且实验中我们所测得的DPPH样品中的g因子和地磁场的垂直分布的值都和理论值比较相近。关键词：核磁共振波谱法核磁共振旋磁比朗德因子电子自旋共振II毕业论文外文摘要TitleExperimentalstudyonnuclearmagneticresonanceAbstractInthispaper,twoexperimentsonMRIandelectronspinresonanceexperimentswereusedtostudythechangesofternessofresonancesignalsandthecalculationofcorrelationamountsinthenuclearmagneticresonanceandelectronspinresonanceexperimentsafterchangingdifferentconditions.IntheMRIexperiment,weusedtheinternalandexternalsweepmethodstoobservethechangeofthemagneticcoreinchangingthedifferentconditionsoftheresonancesignalMRIsignalisfoundthat,givenadefinitemagneticfield,thepeakwiththeedgemagneticfieldandfrequencychangespacingdistanceisalsochanging,buttheimageissymmetrical.Withtheincreaseoffrequency,theresonancesignalimageismovingtobothsides,onthecontrary,withtheincreaseoftheedgemagneticfield,theNUCLEARmagneticresonancesignalmapappearsclosertothemiddlephenomenon.Undertheexternalsweepmethod,wefindthatunderagivendefinitemagneticfield,thepositionoftheresonantsignalimageandthesizeoftheimagewillchangewiththefrequencyandthesizeoftheedgemagneticfield,andthesizeoftheimageandthewavepositionwillchange.Asthefrequencyincreases,wefindthattheresonantsignalmapmovestotheright,butdoesnotcauseverticalchanges.Thevaluesofhydrogennucleoidsandg,aswellasfluorine,weremeasured.Comparewiththeoreticalvaluesandanalyzethesourceoferrors.Intheelectronspinexperiment,wefoundthatasthefrequencyincreases,thespacingbetweenthewavesintheoscilloscopedecreases,andthemiddlewaveswantthetwoendstostartmoving.AstheB_0increases,thewavesintheIIIoscilloscopewillpolarize,andthewavesinthemiddlewillgetcloserandclosertothemiddleuntilthewavescoincide,thewaveformsbecomehigher,andinthesameoscilloscope,thewavesatbothendsmovetowardbothendsandthewaveformsbecomehigher.Andthevaluesoftheg-factorandtheverticaldistributionofthegeomagneticfieldintheDPPHsampleswemeasuredintheexperimentweresimilartothetheoreticalvalues.KeywordsNuclearmagneticresonancespectroscopyNuclearmagneticresonanceGyromagneticratioLande-factorElectronspinresonance目次1引言.............................................................11.1核磁共振技术的发展.............................................11.2核磁共振技术的应...............................................22实验原理.................................
