Abstract
New ESR experiments based on techniques of two-dimensional correlation spectroscopy have been shown to be useful in the determination of magnetization transfer rates in motionally narrowed nitroxides. Spectral enhancement based upon linear prediction with singular value decomposition (LPSVD) is applied in the present work to project 2D absorption lineshapes and to dramatically improve the signal/noise ratio. Heisenberg spin exchange rates obtained from volume integrals of LPSVD-projected 2D absorption lineshapes compare well with those obtained from absolute value peak amplitudes in the case of 2,2,6,6-tetramethyl-4-piperidone- N-oxyl- d 16 (pd-tempone) dissolved in toluene- d 8 (where theory predicts that the two should agree).
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