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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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 languageEnglish (US)
Article number174504
JournalJournal of Chemical Physics
Volume122
Issue number17
DOIs
StatePublished - May 1 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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    Morton, J. J. L., Tyryshkin, A. M., Ardavan, A., Porfyrakis, K., Lyon, S. A., & Briggs, G. A. D. (2005). A new mechanism for electron spin echo envelope modulation. Journal of Chemical Physics, 122(17), [174504]. https://doi.org/10.1063/1.1888585