Optically detected nuclear spin alignment in halogenated organic compounds

Abstract

Optically detected NQR experiments in ground and excited electronic states of the model compound p-dichlorobenzene in p-dibromobenzene can be described by a time-dependent chlorine nuclear spin alignment. The influence of light intensity, microwave and radio frequency power are investigated. The comparison of the experimental results with model calculations for the optical pumping cycle is in quantitative agreement with the theoretical prediction. The largest obtained alignment for 35Cl is 0.54 in the case of a limited spin reservoir.