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Broadband inversion for MAS NMR with single-sideband-selective adiabatic pulses

机译:单边带选择性绝热脉冲的MAS NMR宽带反演

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摘要

We explain how and under which conditions it is possible to obtain an efficient inversion of an entire sideband family of several hundred kHz using low-power, sideband-selective adiabatic pulses, and we illustrate with some experimental results how this framework opens new avenues in solid-state NMR for manipulating spin systems with wide spinning-sideband (SSB) manifolds. This is achieved through the definition of the criteria of phase and amplitude modulation for designing an adiabatic inversion pulse for rotating solids. In turn, this is based on a framework for representing the Hamiltonian of the spin system in an NMR experiment under magic angle spinning (MAS). Following earlier ideas from Caravatti et al. [J. Magn. Reson. 55, 88 (1983)], the so-called "jolting frame" is used, which is the interaction frame of the anisotropic interaction giving rise to the SSB manifold. In the jolting frame, the shift modulation affecting the nuclear spin is removed, while the Hamiltonian corresponding to the RF field is frequency modulated and acquires a spinning-sideband pattern, specific for each crystallite orientation.
机译:我们将说明如何以及在何种条件下使用低功率,边带选择性绝热脉冲来获得数百kHz整个边带族的有效反转,并通过一些实验结果说明该框架如何在固体中开辟新的途径态NMR,用于控制具有宽旋转边带(SSB)歧管的自旋系统。这是通过定义用于设计旋转固体的绝热反转脉冲的相位和幅度调制标准来实现的。反过来,这是基于在魔角旋转(MAS)下的NMR实验中表示自旋系统的哈密顿量的框架。遵循Caravatti等人的早期观点。 [J.真是的雷森55,88(1983)],使用所谓的“摇动框架”,它是引起SSB流形的各向异性相互作用的相互作用框架。在颠簸帧中,消除了影响核自旋的移位调制,而对与RF场相对应的哈密顿量进行了频率调制,并获得了特定于每个微晶取向的旋转边带图案。

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