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Cavity induced shift and narrowing of the positronium Lyman-α transition

Cassidy, DB; Hisakado, TH; Tom, HWK; Mills, AP; Bromley, MWJ; Cota, LC; (2011) Cavity induced shift and narrowing of the positronium Lyman-α transition. Physical Review Letters , 106 (2) , Article e023401. 10.1103/PhysRevLett.106.023401. Green open access

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Abstract

We report experiments in which the line shape of the Lyman-alpha (1S-2P) transition was measured for positronium (Ps) atoms both inside and outside a porous silica target. The energy interval ΔE for confined atoms was observed to be larger than that of free Ps by 1.26±0.06meV. A configuration interaction calculation yields results that are consistent with our ∼5nm sample, and suggests that ΔE decreases dramatically for larger cavity diameters. The linewidth of the transition, (0.066±0.004)nm (FWHM), is about half of what one would expect for free Ps at room temperature due to the Dicke line narrowing effect of confinement. Such measurements can be used to determine void sizes in porous films and Ps dynamics therein, and elimination of the Doppler spread of atoms in a porous film could be useful for the efficient excitation of a Ps gas. © 2011 The American Physical Society.

Type: Article
Title: Cavity induced shift and narrowing of the positronium Lyman-α transition
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.106.023401
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.106.023401
Language: English
Additional information: © 2011 The American Physical Society
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1362301
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