Fourier transform ESR methods have been extended to permit spatially resolved two-dimensional (2D)-ESR experiments. This is illustrated for the case of 2D-electron-electron double resonance (2D-ELDOR) spectra of nitroxides in a liquid that exhibits appreciable cross-peaks due to Heisenberg spin exchange. The use of spin-echo decays in spatially resolved FT-ESR is also demonstrated.
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We thank Dr. David E. Budil for his 3D graphics efforts. This work was supported by NSF Grants DMR89-01718 and CHE90-04552 and NIH Grant GM-25862.