Abstract
In order to provide a larger data base for understanding the whys and why nots of muonium formation in solids, we have been searching for Mu in predominantly crystalline environments. We have observed muonium in room temperature diamond, and report on a brief study of the temperature behaviour of its asymmetry and relaxation. These results are radically different from all previous diamond results. We have not been able to detect any Mu in SrTiO3, ZrSiO4, or TiO2, but in GeO2 there is a tiny signal in both a fused sample and a hexagonal single crystal, but none in a tetragonal crystal. Since hexagonal GeO2 is structurally similar to quartz, one would naively expect similar amounts of Mu. Such is not the case, the reasons for which are not understood at this time. In SrTiO3, the muon asymmetry is a strong function of temperature.
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