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- W2070052278 abstract "A technique is described for the study of slow molecular motions that employs two‐dimensional electron spin echo (2D‐ESE) spectroscopy. An ‘‘echo‐induced ESR spectrum’’ is obtained with a two pulse 90° (τ)/() 180° sequence by recording the echo height as the dc field is swept. A series of sweeps with different τ are Fourier transformed to yield a two‐dimensional spectrum comprised of an echo‐induced spectrum along the x axis and the homogeneous widths along the y axis. A convenient theoretical analysis appropriate for slow motions is given and it is shown that the 2D spectrum may be regarded as a graph of the widths vs the resonance positions of the individual ‘‘dynamics spin packets’’ that constitute the spectrum. An experimental study of the spin probe Tempone in 85% glycerol/H2O solvent for slow motions (i.e., rotational correlational times of order 10−5–10−6 s) shows variations in homogeneous widths (i.e., T−12) over the spectrum. This is analyzed in terms of canonical models of rotational reorientation—Brownian, free, and jump diffusion, and it is found that the variations of T−12 across the spectrum show features similar to a Brownian model. A special normalized contour plot of the 2D spectra is introduced which clearly emphasizes the variation of T−12 across the spectrum. The enhanced information content of these 2D spectra is discussed, and it is shown how 2D‐ESE spectroscopy is both an improvement on and a complement to cw techniques for studying motional dynamics. Experimental extensions and limitations are also discussed." @default.
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- W2070052278 date "1984-07-01" @default.
- W2070052278 modified "2023-10-02" @default.
- W2070052278 title "Two‐dimensional electron spin echo spectroscopy and slow motions" @default.
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- W2070052278 doi "https://doi.org/10.1063/1.447316" @default.
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