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.

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.

Download activity - last month

Export as XMLJSONCSV

Download activity - last 12 months

Export as JSONCSVXML

Downloads by country - last 12 months

Export as XMLJSONCSV

Archive Staff Only

View Item