A new mechanism for electron spin echo envelope modulation

被引：20

作者：

Morton, JJL ^{[1
]}

Tyryshkin, AM

Ardavan, A

Porfyrakis, K

Lyon, SA

Briggs, GAD

机构：

[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

[2] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA

[3] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

来源：

JOURNAL OF CHEMICAL PHYSICS | 2005年 / 122卷 / 17期

基金：

美国国家科学基金会; 英国工程与自然科学研究理事会;

关键词：

Electron transitions;

D O I：

10.1063/1.1888585

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：

Electron spin echo envelope modulation (ESEEM) has been observed for the first time from a coupled heterospin pair of electron and nucleus in liquid solution. Previously, modulation effects in spin-echo experiments have only been described in liquid solutions for a coupled pair of homonuclear spins in nuclear magnetic resonance or a pair of resonant electron spins in electron paramagnetic resonance. We observe low-frequency ESEEM (26 and 52 kHz) due to a new mechanism present for any electron spin with S > 1/2 that is hyperfine coupled to a nuclear spin. In our case these are electron spin (S = 3/2) and nuclear spin (I = 1) in the endohedral fullerene N@C-60. The modulation is shown to arise from second-order effects in the isotropic hyperfine coupling of an electron and N-14 nucleus. (c) 2005 American Institute of Physics.

引用

页数：7

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