Measurement of the lifetime and quenching rate of metastable 2S muonic helium ions |
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| Authors: | HP von Arb F Dittus H Heeb H Hofer F Kottmann S Niggli R Schaeren D Taqqu J Unternährer P Egelhof |
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| Institution: | Institut für Hochenergiephysik, ETH-Hönggerberg, CH-8093 Zurich, Switzerland;Institut für Physik, Universität Basel, CH-4056 Basel, Switzerland |
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| Abstract: | The lifetime of the 2S state in (μ?4He)+ ions has been measured at He-gas pressures between 50 Torr and 6 atm (T=300 K). We observed both X-rays from the two-photon 2S→1S transitions as well as delayed Kα X-rays associated with radiative quenching. The quenching rate is strongly pressure dependent; it is predominantly a quadratic function of pressure with a measured three-body rate coefficient k=(5.9±0.8)×10?32cm6/s. At 6 atm, we find τ2S<250 ns because of the absence of two-photon transitions. |
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