Resonant Mixing Dynamic Nuclear Polarization

被引：3

作者：

Quan, Yifan ^{[1
,2
]}

Ouyang, Yifu ^{[1
,2
]}

Mardini, Michael ^{[1
,2
]}

Palani, Ravi Shankar ^{[1
,2
]}

Banks, Daniel ^{[3
]}

Kempf, James ^{[3
]}

Wenckebach, W. Tom ^{[4
,5
]}

Griffin, Robert G. G. ^{[1
,2
]}

机构：

[1] MIT, Francis Bitter Magnet Lab, Cambridge, MA 02139 USA

[2] MIT, Dept Chem, Cambridge, MA 02139 USA

[3] Bruker Biospin, Billerica, MA 01821 USA

[4] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[5] Univ Florida, Natl High Magnet Field Lab, Gainesville, FL 32310 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2023年 / 14卷 / 31期

基金：

瑞士国家科学基金会; 美国国家卫生研究院;

关键词：

Coupled spins - Cross effects - Density matrix - Dynamic nuclear polarization - Microwave field - Mixing dynamics - Overhauser effect - Simple++ - Solid effects - Thermal mixing process;

D O I：

10.1021/acs.jpclett.3c01869

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：

We propose a mechanism for dynamic nuclear polarizationthat isdifferent from the well-known Overhauser effect, solid effect, crosseffect, and thermal mixing processes. We term it ResonantMixing (RM), and we show that it arises from the evolutionof the density matrix for a simple electron-nucleus coupledspin pair subject to weak microwave irradiation, the same interactionsas the solid effect. However, the SE is optimal when the microwavefield is off-resonance, whereas RM is optimal when the microwave fieldis on-resonance and involves the mixing of states by the microwavefield together with the electron-nuclear coupling. Finally,we argue that this mechanism is responsible for the observed dispersive-shapedDNP field profile for trityl samples near the electron paramagneticresonance center.

引用

页码：7007 / 7013

页数：7

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