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Microwave spectroscopy of the muonium state in BeO
Authors: Lord, J.S.; Vilao, R.C.; Alberto, H.V.; Doll, A.; Mengyan, P.W.; Baker, B.B.; Goeks, M.
Ref.: 16th International Conference on Muon Spin Rotation, Relaxation and Resonance, St. John's, Canada, JUL 20-25, 2025. 3222, 012007 (2026)
Abstract: The remarkable thermal, optical and mechanical properties of beryllium oxide lead to a number of applications, however little is known about the behaviour of hydrogen in BeO, which can be as high as 4% in thin films. We used positive muons as a model for hydrogen. Earlier TF data shows both diamagnetic and muonium states and a large "missing fraction". We measured the muonium fraction using microwave resonance and a novel design of microwave cell which allows "flypast" operation with a small sample. The muonium fraction is found to be larger than that measured by TF-muSR - also unlike the decrease seen in the TF result, the amplitude increases slightly in the range 300-400 K. Measurements with delayed RF pulses showed a small increase in muonium fraction at base temperature at later times.
