神奇复合脉冲
Magic composite pulses
摘要：
我描述的复合脉冲，在此期间，平均偶极相互作用的自旋系综控制，同时实现全球旋转。所用的构造方法是基于平均哈密顿理论和依赖于自旋-自旋偶极相互作用的几何性质。我提出了几个这样的复合脉冲对NRM的标准实验缺陷鲁棒性：静态或射频场失调，场的不均匀性。数值模拟表明，魔术三明治脉冲序列，一个脉冲序列，反转的平均偶极场，而应用，是困扰由其短的初始和最终π/2射频脉冲起源的缺陷。使用魔复合脉冲代替π/2脉冲改善了魔三明治效应。使用NMR的经典描述的数值测试允许检查魔术复合脉冲的有效性，并估计其效率。
英文摘要：
I describe composite pulses during which the average dipolar interactions within a spin ensemble are controlled while realizing a global rotation. The construction method used is based on the average Hamiltonian theory and rely on the geometrical properties of the spin-spin dipolar interaction only. I present several such composite pulses robust against standard experimental defects in NRM: static or radio-frequency field miscalibration, fields inhomogeneities. Numerical simulations show that the magic sandwich pulse sequence, a pulse sequence that reverse the average dipolar field while applied, is plagued by defects originating from its short initial and final π/2 radio-frequency pulses. Using the magic composite pulses instead of π/2 pulses improves the magic sandwich effect. A numerical test using a classical description of NMR allows to check the validity of the magic composite pulses and estimate their efficiency.
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