(5) NC Verma and RW Fessenden, J. Chem. Phys., 85, 2139 (1976).(6) AD Trifunac and DJ Nelson, J. Am. Chem. SOC., 99, 1745 (1977).(7) Manuscript in preparation.(8) it is important to'note that no CiDNP can originate in the radical pair-O~ CCH~-CHZCO~-. Thus, the CHZCOZ-radical has undergone Doiarization prior to dimerization. The CiDNP observed in acetate suggests that the dominant polarization pathways for CHzCOz-involve encounter ...