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核磁共振基本原理凡具有磁矩的原子核和氢核,置于磁场H_0中,不仅自旋,还沿磁场方向H_0回旋,其回旋频率V_0和磁场强度成正比。如图1所示意: V_0=γ/2π H_0 γ为旋磁比,是常数。若在垂直于磁场H_0方向,加一射频H,逐渐变化其频率,当频率恰等于v_0时,氢核磁矩μ和磁场H_0方向之间夹角产生强烈振动,磁矩取向可以翻转,这个现象称为核磁共振。用量子力学术语来描述,凡自旋量子数l不等于零的原子核都有磁矩,在磁场中,取向的
The basic principles of nuclear magnetic Where the magnetic moment of the nucleus and hydrogen nucleus, placed in the magnetic field H_0, not only spin, but also along the direction of the magnetic field H_0 gyration, the gyration frequency V_0 and magnetic field strength is proportional to. As shown in Figure 1: V_0 = γ / 2π H_0 γ is the gyromagnetic ratio, which is constant. If perpendicular to the magnetic field H_0 direction, plus a radio frequency H, gradually changing its frequency, when the frequency is exactly equal to v_0, the proton magnetic moment μ and the magnetic field H_0 direction between the strong vibration, orientation can be reversed, the phenomenon that For nuclear magnetic resonance. Quantum mechanics terms to describe, where the spin quantum number l is not equal to zero nuclear magnetic moment, in the magnetic field, oriented