Abstract
Muonium (μ +e - or Mu, a light isotope of the H atom) has been directly observed for the first time in solid nitrogen ( 14N 2). In both α-N 2 and β-N 2, muonium is manifest as a long-lived μ +SR spin precession signal at the characteristic Mu frequency in a weak transverse magnetic field. The temperature dependence of this signal'srelaxation rate T 2 −1 indicates that the diffusion of Mu involves quantum tunneling; a theory is presented that qualitatively explains T 2 −1( T) in nitrogen.
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