Formation of muonic hydrogen at extremely low gas pressure

Earlier measurements with the magnetic bottle technique showed, that the lifetime of the metastable 2s state of muonic hydrogen is drastically shortened by external Stark collisions at 150 torr H2-pressure. Since the technique works even at gas pressures below 1 torr, where the 2s-lifetime is several hundred ns, it was necessary to plan the intended laser-resonance experiment (to measure the 2s-2p energy difference) for such an extremely low gas pressure. (Auth.)