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电子顺磁共振技术是研究物质中未成对电子自旋状态,以及对物质结构和能量传递方式的重要手段。利用调制磁场和锁相放大器在教学用大华电子顺磁共振系统上的改造,获得一阶微分吸收信号,并利用NI LabVIEW软件平台实现信号的控制和采集,获得标准样品DPPH的弛豫时间和朗德尔因子大小。通过实验教学,使同学们对调制磁场和锁相放大器在磁学实验中微弱信号的处理技术应用上有了更直观的理解,提高了综合实验技能。
Abstract：Electron paramagnetic resonance(EPR) is a powerful technique for probing the spin states of unpaired electrons and for elucidating the structure and energy-transfer pathways of matter. By retrofitting the teaching-grade Dahua EPR spectrometer with a modulation field and a lock-in amplifier, we obtain the first-derivative absorption signal and employ the NI Lab VIEW platform to automate signal control and data acquisition. Using the standard DPPH sample, the relaxation time and Lander factor are determined. Through this experiment, students gain an intuitive appreciation of how modulation fields and lock-in amplifiers are used to handle weak signals in magnetic-resonance investigations, thereby enhancing their overall experimental proficiency.
[1]MORTONJ,TYRYSHKINA,BROWNR,etal.Solid-31[]statequantummemoryusingthePnuclearspinJ.Nature,2008,455:1085-1088.
[2]DU J, RONG X, ZHAO N, et al. Preserving electron spin coherence in solids by optimal dynamical decoupling[J].Nature,2009,461:1265-1268.
[3]FENG G, CHENG P, YAN W, et al. Accelerated crystallization of zeolites via hydroxyl free radicals[J]. Science,2016, 351(6278):1188-91.
[4]ROESSLER M, SALVADORI E. Principles and applications of EPR spectroscopy in the chemical sciences[J].Chemical Society Reviews, 2018, 47(8):2534-2553.
[5]JESCHKE G. The contribution of modern EPR to structural biology[J]. Emerging Topics in Life Sciences, 2018, 2(1):9-18.
[6]DUSS O, YULIKOV M, JESCHKE G, et al. EPR-aided approach for solution structure determination of large RNAs or protein-RNA complexes[J]. Nat Commun, 2014, 5:1-9.
[7]SAJFUTDINOV R, SAJFUTDINOV R, LARINA L, et al. Electron Paramagnetic Resonance in Biochemistry and Medicine[M]. Springer, 2013.
[8]SEALY R, HYDE J, FELIX C, et al. Eumelanins and pheomelanins:Characterization by electron spin resonance spectroscopy[J]. Science, 1982, 217(4559):545-547.
[9]张全哲,邹升,张红.基于电子顺磁共振谱的残磁测量应用及进展[J].光谱学与光谱析,2024,44(1):22-28.ZHANG Q Z, ZOU S, ZHANG H. Application and progress of residual magnetometry based on electron paramagnetic resonance spectroscopy[J]. Spectroscopy and Spectral Analysis, 2024, 44(1):22-28.(in Chinese)
[10]袁嘉悦,付鹏翔,高松,等.高频高场电子顺磁共振技术在自旋量子态研究中的应用[J].仪器仪表学报,2024,45(3):144-156.YUANJR,FUPX,GAOS,etal.Theapplicationof high-frequency/high-fieldelectronparamagneticresonance d[]intheresearchonspinquitsJ.ChineseJournalofScientificInstrument,2024,45(3):144-156.(inChinese)
[11]WEIL J, BOLTON J. Electron paramagnetic resonance:Elementary theory and practical applications[M]. Hoboken:John Wiley&Sons Inc, 2007.
[12]SCHWEIGER A, JESCHKE G. Principles of pulse electron paramagnetic resonance[M]. Oxford:Oxford University Press, Oxford, 2001.
[13]徐元植.实用电子顺磁共振波谱学基本原理和实际应用[M].北京:科学出版社,2008.XU Y Z. Elementary principle&practical applications[M]. Beijing:Science Press, 2008.(in Chinese)
[14]荣星.脉冲电子顺磁共振谱仪研制及应用[D].合肥:中国科学技术大学,2011.RONG X. The development and application of the pulsed electron paramagneitc resonance spectrometer[D]. Hefei:University of Science and Technology of China, 2008.(in Chinese)
[15]王力,施芸城,李梓萱,等.基于Lab VIEW的电子顺磁共振信号的采集[J].物理实验,2013,33(12):27-29.WANG L, SHI Y C, LI Z X, et al. Measurement of electronic paramagnetic resonance spectrum based on LabVIEW[J]. Physics Experimentation, 2013, 33(12):27-29.(in Chinese)
基本信息:
中图分类号:G642.423;O441.2-4
引用信息:
[1]王力.调制磁场与锁相放大器在电子顺磁共振实验的探索[J].物理与工程,2025,35(06):176-182.
基金信息:
东华大学物理学院教改项目
2025-12-15
2025-12-15