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Journal Article

Measurement of the positronium 13S1-23S1 interval by continuous-wave two-photon excitation


Danzmann,  Karsten
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Fee, M. S., Mills, A. P., Chu, S., Shaw, E. D., Danzmann, K., Chichester, R. J., et al. (1993). Measurement of the positronium 13S1-23S1 interval by continuous-wave two-photon excitation. Physical Review Letters, 70(10), 1397-1400. doi:10.1103/PhysRevLett.70.1397.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-5C4B-4
Using continuous-wave excitation to eliminate the problems inherent with pulsed laser measurements of nonlinear transitions, we have measured the 13S1-23S1 interval in positronium (Ps) to be 1 233 607 216.4±3.2 MHz. The quoted 2.6 ppb (parts per 109) uncertainty is primarily due to the determination of the Ps resonance relative to the Te2 reference line, with a 1.5 ppb contribution from a recent calibration of the Te2 line relative to the hydrogen 1S-2S transition. The uncertainty corresponds to 3.5×10-5 of the α2R∞ QED contribution to the 13S1-23S1 interval. Our measurement is sufficiently accurate to provide a test of the as yet uncalculated α4R∞ QED corrections.