UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Controlling Positronium Annihilation with Electric Fields

Alonso, AM; Cooper, BS; Deller, A; Hogan, SD; Cassidy, DB; (2015) Controlling Positronium Annihilation with Electric Fields. Physical Review Letters , 115 (18) , Article 183401. 10.1103/PhysRevLett.115.183401. Green open access

[img]
Preview
Text
Cassidy_PhysRevLett.115.183401.pdf - Published version

Download (651kB) | Preview

Abstract

We show that the annihilation dynamics of excited positronium (Ps) atoms can be controlled using parallel electric and magnetic fields. To achieve this, Ps atoms were optically excited to n ¼ 2 sublevels in fields that were adjusted to control the amount of short-lived and long-lived character of the resulting mixed states. Inclusion of the former offers a practical approach to detection via annihilation radiation, whereas the increased lifetimes due to the latter can be exploited to optimize resonance-enhanced two-photon excitation processes (e.g., 13S → 23P → nS=nD), either by minimizing losses through intermediate state decay, or by making it possible to separate the excitation laser pulses in time. In addition, photoexcitation of mixed states with a 23S1 component represents an efficient route to producing long-lived pure 23S1 atoms via single-photon excitation.

Type: Article
Title: Controlling Positronium Annihilation with Electric Fields
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.115.183401
Publisher version: http://doi.org/10.1103/PhysRevLett.115.183401
Language: English
Additional information: © 2015 American Physical Society
Keywords: Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, FIRST EXCITED-STATE, 1S-2S TRANSITION, MAGNETIC-FIELDS, METAL-SURFACES, LASER FIELDS, EXCITATION, FREQUENCY, HYDROGEN, PS, SPECTROSCOPY
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/1488646
Downloads since deposit
65Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item