Abstract
An applied electric field E is known to affect the probability f Mu of muonium formation in sapphire (Al 2O 3). The (small) amplitude of the long-lived diamagnetic μ +SR signal is increased slightly by positive E (in the direction of the muon's initial momentum), implying a reduction of f Mu as expected for delayed muonium formation where electrons originate “behind” the muon. In contrast to this, the initial amplitude of the short-lived diamagnetic signal (visible directly only at low T) is dramatically decreased (implying enhanced muonium formation at very early times) by positive E . This effect is not yet understood.
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