Sensitive detection of Doppler-free two-photon-excited 2Spositronium by spatially separated photoionization
- 1 July 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 44 (1) , R5-R8
- https://doi.org/10.1103/physreva.44.r5
Abstract
Using a spatially filtered pulsed laser at 486 nm we have photoexcited positronium to the 2S state and detected it via a delayed and spatially separated 532-nm photoionization pulse. We have extended our observations down to low 486-nm power to explore the possibility of a cw measurement of the positronium 1S-2S interval. A model calculation taking into account the velocity distribution of the 235-K positronium from an oxygenated cold Al(111) target, the parameters of the laser beams, and the nonlinear excitation probability explains our data. The same model indicates that a cw measurement is presently feasible.Keywords
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