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ID: 372217.0, MPI für Gravitationsphysik / Laser Interferometry & Gravitational Wave Astronomy
Sensitive detection of Doppler-free two-photon-excited 2S positronium by spatially separated photoionization
Authors:Fee, Michale S.; Mills, A. P.; Shaw, E. D.; Chichester, R. J.; Zuckerman, D. M.; Chu, Steven; Danzmann, Karsten
Date of Publication (YYYY-MM-DD):1991-07
Title of Journal:Physical Review A
Volume:44
Issue / Number:1
Start Page:R5
End Page:R8
Review Status:not specified
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Karsten Danzmann
Affiliations:MPI für Gravitationsphysik/Laser Interferometry & Gravitational Wave Astronomy
MPI für Gravitationsphysik/Teilinstitut Hannover
External Affiliations:Max-Planck-Institute for Quantum Optics, D-8046 Garching, Federal Republic of Germany
Identifiers:URL:http://link.aps.org/abstract/PRA/v44/pR5
ISSN:1094-1622
DOI:10.1103/PhysRevA.44.R5
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