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  Sensitive detection of Doppler-free two-photon-excited 2S positronium by spatially separated photoionization

Fee, M. S., Mills, A. P., Shaw, E. D., Chichester, R. J., Zuckerman, D. M., Chu, S., et al. (1991). Sensitive detection of Doppler-free two-photon-excited 2S positronium by spatially separated photoionization. Physical Review A, 44(1), R5-R8. doi:10.1103/PhysRevA.44.R5.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-5CB8-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-5CB9-E
Genre: Journal Article

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372217.pdf (Publisher version), 794KB
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 Creators:
Fee, Michale S.1, Author
Mills, A. P., Author
Shaw, E. D., Author
Chichester, R. J., Author
Zuckerman, D. M., Author
Chu, Steven, Author
Danzmann, Karsten2, Author              
Affiliations:
1External Organizations, escidoc:persistent13              
2Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, escidoc:24010              

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 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.

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 Dates: 1991-07
 Publication Status: Published in print
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Title: Physical Review A
Source Genre: Journal
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Pages: - Volume / Issue: 44 (1) Sequence Number: - Start / End Page: R5 - R8 Identifier: ISSN: 1094-1622