Measurement of the Positronium $1 {}^{3}S_{1} - 2 {}^{3}S_{1}$ Interval by Doppler-Free Two-Photon Spectroscopy

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7 May 1984

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 52 (19) , 1689-1692
https://doi.org/10.1103/physrevlett.52.1689

Abstract

We have measured the

1 {}^{3}S_{1} - 2 {}^{3}S_{1}

interval in positronium (Ps) to be 1 233 607 185 ± 15 MHz, in agreement to within 1% of the

α^{3} R_{\infty}

QED prediction. The quoted 12-ppb uncertainty has equal contributions from the measurement of the Ps resonance relative to a

{Te}_{2}

absorption line and the calibration of the

{Te}_{2}

line relative to the deuterium

2 S_{\frac{1}{2}} - 4 P_{\frac{3}{2}}

Balmer line.

Keywords

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