Volume 132, Number 1, October 2020
|Number of page(s)||7|
|Section||Atomic, Molecular and Optical Physics|
|Published online||02 November 2020|
Measurement of the annihilation decay rate of 2 3S1 positronium
Department of Physics and Astronomy, University College London - Gower Street, London, WC1E 6BT UK
Received: 24 July 2020
Accepted: 12 October 2020
We report a measurement of the annihilation decay rate of positronium (Ps) atoms, . Ground state atoms optically excited to radiatively metastable states were quenched via Stark mixing by the application of a time-delayed electric field. Rapid radiative decay of the Stark mixed states to the ground state, followed by self-annihilation, was observed via the annihilation radiation time spectrum, and used to determine the number of excited state atoms remaining at different times, and hence the decay rate. We obtain , in broad agreement with the Zeeman-shifted theoretical value of .
PACS: 36.10.Dr – Positronium / 31.50.Df – Potential energy surfaces for excited electronic states / 32.70.Cs – Oscillator strengths, lifetimes, transition moments
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