Abstract
We report experiments in which positronium (Ps) atoms are produced in the level by single-photon excitation from the ground state. To accomplish this, Stark-mixed states were optically excited in electric fields. By adiabatically switching off the electric field after laser excitation, some of the mixed states evolved into pure levels, whose presence was detected via the time dependence of their annihilation radiation. The observed production efficiency relative to that of Rydberg Ps states is consistent with a Monte Carlo simulation that takes into account the rate at which the electric fields were switched off.
1 More- Received 26 January 2017
DOI:https://doi.org/10.1103/PhysRevA.95.033408
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