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磁共振波谱是基于利用有自旋矩的原粒子在外磁场作用下的能级劈裂,使其与外电磁场能量发生共振吸收(或发射)的波谱。核磁共振(NMR)所观察的是自旋核的磁能级间的跃迁。在目前一般可达的磁场强度下,能与其发生共振跃迁的电磁波频率落于射频区,即在几十兆赫至几百兆赫之间。而电子自旋共振(ESR或EPR)观察的是不成对电子磁能级间的跃迁,其共振频率则落于微波区,即在几千兆赫至几十千兆赫之间。由于磁共振领域广阔和
Magnetic Resonance Spectroscopy (MRS) spectroscopy is based on the splitting of an energy level by the action of an external magnetic field by a primary particle that has a spin-torque so that it resonates (or emits) with the energy of the external electromagnetic field. Nuclear magnetic resonance (NMR) observed is the transition between the magnetic energy levels of the spin nucleus. Under the currently available magnetic field strength, the frequencies of the electromagnetic waves with which the resonance transition can occur fall within the radio frequency region, that is, between tens of megahertz to several hundred megahertz. Electron spin resonance (ESR or EPR) observes transitions between unpaired electron-magnetic levels, with resonant frequencies falling within the microwave range, ie, from a few gigahertz to tens of gigahertz. Due to the vast field of magnetic resonance