Abstract
The effect of molecular motion on electron-electron double resonance (ELDOR) spectra was studied using the ĊH 2COO − radical in irradiated zinc acetate. Under conditions where the product of the frequency difference (Δω) between two coalescing lines and the correlation time (r) approximately equals 2 ( Δωτ ∼- 2), the motion in the radical causes a portion of the ELDOR spectrum to broaden and disappear. This effect may be used to interpret complicated ESR spectra which result from overlapping lines of several radicals in the same sample. This was illustrated using irradiated glycine which contains the radicals NH 3 + C ̇ HCOO − and ĊH 2COO −. Using the ELDOR technique the hyperfine splittings of these overlapped spectra could be accurately measured at any temperature and the transition from nonequivalent protons at low temperatures to complete equivalence at higher temperatures could be followed.
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