The enrichment of germanium-73 with the magnetic isotope effect (MIE)
succeeded, for the first time, in the presence and absence of magnetic
fields. At 200 G, the photolysis of methyltriphenylgermane in a Brij3
5 micellar solution under 92.8% conversion gave the 4% enrichment of g
ermanium-73 (alpha = 0.015). Germanium-73 is the heaviest magnetic iso
tope to have so far been enriched with MIE from samples of natural abu
ndance.