H AND MU DIFFUSION IN ICE

Detailed studies of muonium in ice carried out at TRIUMF in the mid ei ghties directly inspired EPR investigation of H and D atoms in ice at the Argonne National Laboratory, using a pulsed EPR spectrometer in co njunction with a Van de Graaff electron accelerator. T2 measurements w ere made by the spin-echo method, Subsequent work resulted in a measur ement of the longitudinal spin relaxation time T1 at a single temperat ure. In combination with T2 this permits an unambiguous determination of the strength of the magnetic interaction giving rise to relaxation, and hence permits conversion of all the existing T2 data to diffusion al correlation times, tau. We have recently initiated a further study bf muonium in ice, this time concentrating on T1 measurements. Prelimi nary work shows the feasibility of determining tau from the field depe ndence of T1 at a given temperature. The result is in good agreement w ith our earlier, less direct determinations.