/到 生物核磁共振波谱学 NMR in Biological Science 2 Basics of nmr THNMR AN
生物核磁共振波谱学 NMR in Biological Science 2. Basics of NMR THNMR YAN
What is nmr? NMR, Nuclear Magnetic Resonance, is a phenomenon which occurs when the nuclei of certain atoms are immersed in a static magnetic field and exposed to a second oscillating magnetic field 核磁共振是指核磁矩不为零的核,在外磁场的作用下,核 自旋能级发生塞曼分裂( Zeeman splitting),共振吸收某 特定频率的射频( radio frequency,RF)辐射的物理过程。 Ref:http://www.nmr.de THNMR AN
What is NMR? NMR, Nuclear Magnetic Resonance, is a phenomenon which occurs when the nuclei of certain atoms are immersed in a static magnetic field and exposed to a second oscillating magnetic field. 核磁共振 是指核磁矩不为零的核，在外磁场的作用下，核 自旋能级发生塞曼分裂(Zeeman splitting），共振吸收某一 特定频率的射频（radio frequency, RF）辐射的物理过程。 Ref: http://www.nmr.de THNMR YAN
2.1 Spin Physics What is spin? Spin is a fundamental property of nature like electrical charge or mass Spin comes in multiples of 1/2 and can be t or- Protons, electrons, and neutrons possess spin. Individual unpaired electrons, protons, and neutrons each possesses a spin of 1/2 THNMR AN
2.1 Spin Physics What is spin? Spin is a fundamental property of nature like electrical charge or mass. Spin comes in multiples of 1/2 and can be + or -. Protons, electrons, and neutrons possess spin. Individual unpaired electrons, protons, and neutrons each possesses a spin of 1/2. THNMR YAN
2.1 Spin Physics Nuclei with spin 1)/=0,当中子数、质子数均为偶数;如:12C、16O 2)/=半整数,当中子数与质子数一为奇数,一为偶数 如:/=1/2:1H、13C、15N、19F、31P /=3/2:23Na、35Cl、3K. /=5/2:17O、25Mg 3)/=整数,当中子数与质子数均为奇数,如2H、14N
2.1 Spin Physics Nuclei with spin 1）I = 0，当中子数、质子数均为偶数；如：12C、 16O… 2）I = 半整数，当中子数与质子数一为奇数，一为偶数 如： I = 1/2：1H、 13C、 15N、 19F、 31P… I = 3/2：23Na、 35Cl、 39K… I = 5/2：17O、 25Mg… 3） I = 整数，当中子数与质子数均为奇数，如2H、 14N…
原子核的自旋角动量与磁矩 自旋量子数不为零时,原子核具有自旋角动量P P=v(+少 1=√/(+1)h 2兀 原子核磁矩与自旋角动量之间存在如下关系: μ=yP Y为磁旋比 magnetogyric ratio)或 旋磁比 gyromagnetic ratio)
原子核的自旋角动量与磁矩 自旋量子数I不为零时，原子核具有自旋角动量P 原子核磁矩与自旋角动量之间存在如下关系： 为磁旋比(magnetogyric ratio)或 旋磁比(gyromagnetic ratio) ( 1) 2 ( 1) = + = + I I h P I I = P