A new mechanism for electron spin echo envelope modulation

John J.L. Morton; Alexei M. Tyryshkin; Arzhang Ardavan; Kyriakos Porfyrakis; S. A. Lyon; G. Andrew D. Briggs

doi:10.1063/1.1888585

A new mechanism for electron spin echo envelope modulation

John J.L. Morton, Alexei M. Tyryshkin, Arzhang Ardavan, Kyriakos Porfyrakis, S. A. Lyon, G. Andrew D. Briggs

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21 Scopus citations

Abstract

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>12 that is hyperfine coupled to a nuclear spin. In our case these are electron spin (S=32) and nuclear spin (I=1) in the endohedral fullerene N@ C60. The modulation is shown to arise from second-order effects in the isotropic hyperfine coupling of an electron and N14 nucleus.

Original language	English (US)
Article number	174504
Journal	Journal of Chemical Physics
Volume	122
Issue number	17
DOIs	https://doi.org/10.1063/1.1888585
State	Published - May 2005

All Science Journal Classification (ASJC) codes

General Physics and Astronomy
Physical and Theoretical Chemistry

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@article{e247064044314f8a838d1e26dcec74ec,

title = "A new mechanism for electron spin echo envelope modulation",

abstract = "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>12 that is hyperfine coupled to a nuclear spin. In our case these are electron spin (S=32) and nuclear spin (I=1) in the endohedral fullerene N@ C60. The modulation is shown to arise from second-order effects in the isotropic hyperfine coupling of an electron and N14 nucleus.",

author = "Morton, {John J.L.} and Tyryshkin, {Alexei M.} and Arzhang Ardavan and Kyriakos Porfyrakis and Lyon, {S. A.} and Briggs, {G. Andrew D.}",

note = "Funding Information: We would like to thank Wolfgang Harneit{\textquoteright}s group at the Hahn–Meitner Institute for providing nitrogen-doped fullerenes, John Dennis at Queen Mary{\textquoteright}s College, London, and Martin Austwick and Gavin Morley for the purification of N @ C 60 . A Foresight LINK grant Nanoelectronics at the quantum edge , an EPSRC grant, and the Oxford-Princeton Link fund supported this project. We thank Brendon Lovett for valuable discussions. A.A. is supported by the Royal Society. Work at Princeton was supported by the NSF International Office through the Princeton MRSEC Grant No. DMR-0213706 and by the ARO and ARDA under Contract No. DAAD19-02-1-0040. ",

year = "2005",

month = may,

doi = "10.1063/1.1888585",

language = "English (US)",

volume = "122",

journal = "Journal of Chemical Physics",

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T1 - A new mechanism for electron spin echo envelope modulation

AU - Morton, John J.L.

AU - Tyryshkin, Alexei M.

AU - Ardavan, Arzhang

AU - Porfyrakis, Kyriakos

AU - Lyon, S. A.

AU - Briggs, G. Andrew D.

N1 - Funding Information: We would like to thank Wolfgang Harneit’s group at the Hahn–Meitner Institute for providing nitrogen-doped fullerenes, John Dennis at Queen Mary’s College, London, and Martin Austwick and Gavin Morley for the purification of N @ C 60 . A Foresight LINK grant Nanoelectronics at the quantum edge , an EPSRC grant, and the Oxford-Princeton Link fund supported this project. We thank Brendon Lovett for valuable discussions. A.A. is supported by the Royal Society. Work at Princeton was supported by the NSF International Office through the Princeton MRSEC Grant No. DMR-0213706 and by the ARO and ARDA under Contract No. DAAD19-02-1-0040.

PY - 2005/5

Y1 - 2005/5

N2 - 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>12 that is hyperfine coupled to a nuclear spin. In our case these are electron spin (S=32) and nuclear spin (I=1) in the endohedral fullerene N@ C60. The modulation is shown to arise from second-order effects in the isotropic hyperfine coupling of an electron and N14 nucleus.

AB - 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>12 that is hyperfine coupled to a nuclear spin. In our case these are electron spin (S=32) and nuclear spin (I=1) in the endohedral fullerene N@ C60. The modulation is shown to arise from second-order effects in the isotropic hyperfine coupling of an electron and N14 nucleus.

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A new mechanism for electron spin echo envelope modulation

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