Abstract
Electron-nuclear double resonance (ENDOR) and electron-nuclear-nuclear triple resonance (TRIPLE) spectra of pristine cis -rich (CH) x at low temperatures are consistent with the spin density distribution of the soliton predicted for a finite electron correlation. The ratio of the peak value of the negative spin density ρ(1) to that of the positive spin density ρ(0) is determined to be ρ(1)/ρ(0)∼-0.44 with the aid of ENDOR-induced ESR measurements. On the other hand, intrinsic ENDOR spectra due to the soliton spin density is not observable in 13 C-enriched samples because of the line shape distortion caused by the overlapping second-harmonic signal of 13 C nuclear frequency and other structures at frequencies related to 1 H and 13 C nuclear Larmor frequencies.
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