Cross-Effect Dynamic Nuclear Polarization Explained: Polarization, Depolarization, and Oversaturation

被引：34
作者：
Equbal, Asif [1 ]
Leavesley, Alisa [1 ]
Jain, Sheetal Kumar [1 ]
Han, Songi [1 ,2 ]
机构：
[1] Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USA
[2] Univ Calif Santa Barbara, Dept Chem Engn, Santa Barbara, CA 93106 USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2019年 / 10卷 / 03期
基金：
美国国家科学基金会;
关键词：
THEORETICAL ASPECTS; SOLID-STATE; RESONANCE; NMR; SENSITIVITY; GHZ; AGENTS; EPR;
D O I：
10.1021/acs.jpclett.8b02834
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The scope of this Perspective is to analytically describe NMR hyperpolarization by the three-spin cross effect (CE) dynamic nuclear polarization (DNP) using an effective Hamiltonian concept. We apply, for the first time, the bimodal operator-based Floquet theory in the Zeeman interaction frame for two and three coupled spins to derive the known interaction Hamiltonian for CE-DNP. With a unified understanding of CE-DNP, and supported by empirical observation of the state of electron spin polarization under the given experimental conditions, we explain diverse manifestations of CE from oversaturation, enhanced hyperpolarization by broad-band saturation, to nuclear spin depolarization under magic-angle spinning.
引用
收藏
页码：548 / 558
页数：21
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