MAGNETIC-RESONANCE ON SINGLE NUCLEI

The magnetic resonance signal of individual hydrogen nuclei has been d etected. The experiments have been performed on a single pentacene mol ecule with the aid of optically detected electron nuclear double reson ance. Two nuclear magnetic resonance lines of 30 kHz width have been o bserved as a 3% change in the fluorescence intensity of a single molec ule. The results can be reproduced by a spin Hamilton operator describ ing the interaction of a single electron spin with two hydrogen nuclei .