eprintid: 1472433 rev_number: 24 eprint_status: archive userid: 608 dir: disk0/01/47/24/33 datestamp: 2015-11-10 16:05:42 lastmod: 2021-09-26 22:47:45 status_changed: 2015-11-10 16:05:42 type: article metadata_visibility: show creators_name: Wall, TE creators_name: Alonso, AM creators_name: Cooper, BS creators_name: Deller, A creators_name: Hogan, SD creators_name: Cassidy, DB title: Selective production of Rydberg-stark states of positronium ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F60 note: This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Published by the American Physical Society abstract: Rydberg positronium (Ps) atoms have been prepared in selected Stark states via two-step (1s→2p→nd/ns) optical excitation. Two methods have been used to achieve Stark-state selection: a field ionization filter that transmits the outermost states with positive Stark shifts, and state-selected photoexcitation in a strong electric field. The former is demonstrated for n=17 and 18 while the latter is performed for n=11 in a homogeneous electric field of 1.9 kV/cm. The observed spectral intensities and their dependence on the polarization of the laser radiation are in agreement with calculations that include the perturbations of the intermediate n=2 manifold. Our results pave the way for the generation of Rydberg Ps atoms with large electric dipole moments that are required for the realization of schemes to control their motion using inhomogeneous electric fields, an essential feature of some proposed Ps free-fall measurements requiring focused beams of long-lived atoms. date: 2015-05-01 date_type: published official_url: http://dx.doi.org/10.1103/PhysRevLett.114.173001 oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green article_type_text: Journal Article verified: verified_manual elements_id: 1034373 doi: 10.1103/PhysRevLett.114.173001 language_elements: eng lyricists_name: Cassidy, David lyricists_name: Deller, Adam lyricists_name: Hogan, Stephen lyricists_id: DBCAS57 lyricists_id: AMDEL12 lyricists_id: SHOGA10 actors_name: Deller, Adam actors_name: Barczynska, Patrycja actors_id: AMDEL12 actors_id: PBARC91 actors_role: owner actors_role: impersonator full_text_status: public publication: Physical Review Letters volume: 114 number: 17 article_number: 173001 event_location: United States issn: 1079-7114 citation: Wall, TE; Alonso, AM; Cooper, BS; Deller, A; Hogan, SD; Cassidy, DB; (2015) Selective production of Rydberg-stark states of positronium. Physical Review Letters , 114 (17) , Article 173001. 10.1103/PhysRevLett.114.173001 <https://doi.org/10.1103/PhysRevLett.114.173001>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1472433/1/PhysRevLett.114.173001.pdf