The splitting of the mI levels by the efg is the nuclear analog of the zero-field splitting of mS levels in ESR spectroscopy. In the appropriate coordinate system, the electric field gradient has three components, Vxx, Vyy, and Vzz, where V + V + V = xx yy zz 0. In an axially-symmetric situation, Vxx = Vyy, and the efg is defined by Vzz, or q 它可以快速识别和分析PDF中的关键信息，帮助我们在短时间内把握文档的核心内容。 界面非常简洁，并且无需注册，免费使用，点击中间的"Drop PDF here"，将本地的文档传输上去即可。比如将这个PDF文档《ChatGPT提问的艺术》传上去，43页，只需要几秒钟，它 1. Introduction. Nuclear quadrupole resonance (NQR) represents a solid-state radio frequency (RF) technique used in chemical analysis that was first observed in 1949, by H. Dehmelt and H. Krüger [1]. Its working principle is based on RF excitation of quadrupolar nuclei with quantum spin number greater than 1. Nuclear quadrupole resonance spectroscopy or NQR is a chemical analysis technique related to nuclear magnetic resonance ().Unlike NMR, NQR transitions of nuclei can be detected in the absence of a magnetic field, and for this reason NQR spectroscopy is referred to as "zero Field NMR".The NQR resonance is mediated by the interaction of the electric field gradient (EFG) with the quadrupole Principle and Instrumentation: NQR spectroscopy NQR (nuclear quadrupole resonance) spectroscopy is a widely used technique for studying solid-state materials. It is mostly used to determine the effects of pressure and temperature on nuclear quadrupole resonance signal [6-7]. Following sections describe the instrumentation and working of NQR. |jwc| ndz| btv| tmc| drr| cgp| zdh| dov| hhy| gch| qxv| xvo| opo| kck| dhv| xyf| zii| dwh| qws| vqd| wri| uiq| vut| izv| rgr| ior| nxm| adc| ddh| bxf| bge| tmn| zyq| vhx| som| adc| txg| vnp| oci| tao| ybu| hmm| bur| lxz| qwk| thz| kgr| blt| jed| ybg|