<> <http://www.w3.org/2000/01/rdf-schema#comment> "The repository administrator has not yet configured an RDF license."^^<http://www.w3.org/2001/XMLSchema#string> . <> <http://xmlns.com/foaf/0.1/primaryTopic> <https://discovery.ucl.ac.uk/id/eprint/1472433> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/AcademicArticle> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/Article> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/dc/terms/title> "Selective production of Rydberg-stark states of positronium"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/ontology/bibo/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."^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/dc/terms/date> "2015-05-01" . <https://discovery.ucl.ac.uk/id/document/153007> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/Document> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/ontology/bibo/volume> "114" . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/ontology/bibo/issue> "17" . <https://discovery.ucl.ac.uk/id/publication/ext-10797114> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/Collection> . <https://discovery.ucl.ac.uk/id/publication/ext-10797114> <http://xmlns.com/foaf/0.1/name> "Physical Review Letters"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/dc/terms/isPartOf> <https://discovery.ucl.ac.uk/id/publication/ext-10797114> . <https://discovery.ucl.ac.uk/id/publication/ext-10797114> <http://www.w3.org/2002/07/owl#sameAs> <urn:issn:10797114> . <https://discovery.ucl.ac.uk/id/publication/ext-10797114> <http://purl.org/ontology/bibo/issn> "10797114" . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/ontology/bibo/status> <http://purl.org/ontology/bibo/status/published> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-6d6b40c648453b22c92eca76c852feaa> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1472433#authors> . <https://discovery.ucl.ac.uk/id/eprint/1472433#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1> <https://discovery.ucl.ac.uk/id/person/ext-6d6b40c648453b22c92eca76c852feaa> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-c6a0c4dc9b80322c57f69362f91d27c3> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1472433#authors> . <https://discovery.ucl.ac.uk/id/eprint/1472433#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_2> <https://discovery.ucl.ac.uk/id/person/ext-c6a0c4dc9b80322c57f69362f91d27c3> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-c927970e71630d69f608b6940f014d54> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1472433#authors> . <https://discovery.ucl.ac.uk/id/eprint/1472433#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_3> <https://discovery.ucl.ac.uk/id/person/ext-c927970e71630d69f608b6940f014d54> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-994bb82afd416928a8333accd4d9ddce> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1472433#authors> . <https://discovery.ucl.ac.uk/id/eprint/1472433#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_4> <https://discovery.ucl.ac.uk/id/person/ext-994bb82afd416928a8333accd4d9ddce> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-aa6a399974387083cabd13e08f0a4d97> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1472433#authors> . <https://discovery.ucl.ac.uk/id/eprint/1472433#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_5> <https://discovery.ucl.ac.uk/id/person/ext-aa6a399974387083cabd13e08f0a4d97> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-80f2ec5e4e9e69be1dcaff45b832619b> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/1472433#authors> . <https://discovery.ucl.ac.uk/id/eprint/1472433#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_6> <https://discovery.ucl.ac.uk/id/person/ext-80f2ec5e4e9e69be1dcaff45b832619b> . <https://discovery.ucl.ac.uk/id/person/ext-c6a0c4dc9b80322c57f69362f91d27c3> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-c6a0c4dc9b80322c57f69362f91d27c3> <http://xmlns.com/foaf/0.1/givenName> "AM"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-c6a0c4dc9b80322c57f69362f91d27c3> <http://xmlns.com/foaf/0.1/familyName> "Alonso"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-c6a0c4dc9b80322c57f69362f91d27c3> <http://xmlns.com/foaf/0.1/name> "AM Alonso"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-6d6b40c648453b22c92eca76c852feaa> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-6d6b40c648453b22c92eca76c852feaa> <http://xmlns.com/foaf/0.1/givenName> "TE"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-6d6b40c648453b22c92eca76c852feaa> <http://xmlns.com/foaf/0.1/familyName> "Wall"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-6d6b40c648453b22c92eca76c852feaa> <http://xmlns.com/foaf/0.1/name> "TE Wall"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-994bb82afd416928a8333accd4d9ddce> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-994bb82afd416928a8333accd4d9ddce> <http://xmlns.com/foaf/0.1/givenName> "A"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-994bb82afd416928a8333accd4d9ddce> <http://xmlns.com/foaf/0.1/familyName> "Deller"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-994bb82afd416928a8333accd4d9ddce> <http://xmlns.com/foaf/0.1/name> "A Deller"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-c927970e71630d69f608b6940f014d54> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-c927970e71630d69f608b6940f014d54> <http://xmlns.com/foaf/0.1/givenName> "BS"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-c927970e71630d69f608b6940f014d54> <http://xmlns.com/foaf/0.1/familyName> "Cooper"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-c927970e71630d69f608b6940f014d54> <http://xmlns.com/foaf/0.1/name> "BS Cooper"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-80f2ec5e4e9e69be1dcaff45b832619b> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-80f2ec5e4e9e69be1dcaff45b832619b> <http://xmlns.com/foaf/0.1/givenName> "DB"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-80f2ec5e4e9e69be1dcaff45b832619b> <http://xmlns.com/foaf/0.1/familyName> "Cassidy"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-80f2ec5e4e9e69be1dcaff45b832619b> <http://xmlns.com/foaf/0.1/name> "DB Cassidy"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-aa6a399974387083cabd13e08f0a4d97> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-aa6a399974387083cabd13e08f0a4d97> <http://xmlns.com/foaf/0.1/givenName> "SD"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-aa6a399974387083cabd13e08f0a4d97> <http://xmlns.com/foaf/0.1/familyName> "Hogan"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-aa6a399974387083cabd13e08f0a4d97> <http://xmlns.com/foaf/0.1/name> "SD Hogan"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/EPrint> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/ArticleEPrint> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://purl.org/dc/terms/isPartOf> <https://discovery.ucl.ac.uk/id/repository> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://eprints.org/ontology/hasDocument> <https://discovery.ucl.ac.uk/id/document/153007> . <https://discovery.ucl.ac.uk/id/document/153007> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/Document> . <https://discovery.ucl.ac.uk/id/document/153007> <http://www.w3.org/2000/01/rdf-schema#label> "Selective production of Rydberg-stark states of positronium (Text)"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/document/153007> <http://eprints.org/ontology/hasFile> <https://discovery.ucl.ac.uk/id/eprint/1472433/1/PhysRevLett.114.173001.pdf> . <https://discovery.ucl.ac.uk/id/document/153007> <http://purl.org/dc/terms/hasPart> <https://discovery.ucl.ac.uk/id/eprint/1472433/1/PhysRevLett.114.173001.pdf> . <https://discovery.ucl.ac.uk/id/eprint/1472433/1/PhysRevLett.114.173001.pdf> <http://www.w3.org/2000/01/rdf-schema#label> "PhysRevLett.114.173001.pdf"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://eprints.org/ontology/hasDocument> <https://discovery.ucl.ac.uk/id/document/153008> . <https://discovery.ucl.ac.uk/id/document/153008> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/Document> . <https://discovery.ucl.ac.uk/id/document/153008> <http://www.w3.org/2000/01/rdf-schema#label> "Selective production of Rydberg-stark states of positronium (Other)"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/document/153008> <http://eprints.org/relation/isVersionOf> <https://discovery.ucl.ac.uk/id/document/153007> . <https://discovery.ucl.ac.uk/id/document/153008> <http://eprints.org/relation/isVolatileVersionOf> <https://discovery.ucl.ac.uk/id/document/153007> . <https://discovery.ucl.ac.uk/id/document/153008> <http://eprints.org/relation/islightboxThumbnailVersionOf> <https://discovery.ucl.ac.uk/id/document/153007> . <https://discovery.ucl.ac.uk/id/eprint/1472433> <http://eprints.org/ontology/hasDocument> <https://discovery.ucl.ac.uk/id/document/153009> . <https://discovery.ucl.ac.uk/id/document/153009> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/Document> . <https://discovery.ucl.ac.uk/id/document/153009> <http://www.w3.org/2000/01/rdf-schema#label> "Selective production of Rydberg-stark states of positronium (Other)"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/document/153009> <http://eprints.org/relation/isVersionOf> <https://discovery.ucl.ac.uk/id/document/153007> . <https://discovery.ucl.ac.uk/id/document/153009> <http://eprints.org/relation/isVolatileVersionOf> <https://discovery.ucl.ac.uk/id/document/153007> . <https://discovery.ucl.ac.uk/id/document/153009> 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<https://discovery.ucl.ac.uk/id/eprint/1472433> <http://eprints.org/ontology/hasDocument> <https://discovery.ucl.ac.uk/id/document/153012> . <https://discovery.ucl.ac.uk/id/document/153012> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/Document> . <https://discovery.ucl.ac.uk/id/document/153012> <http://www.w3.org/2000/01/rdf-schema#label> "Selective production of Rydberg-stark states of positronium (Other)"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/document/153012> <http://eprints.org/relation/isVersionOf> <https://discovery.ucl.ac.uk/id/document/153007> . <https://discovery.ucl.ac.uk/id/document/153012> <http://eprints.org/relation/isVolatileVersionOf> <https://discovery.ucl.ac.uk/id/document/153007> . <https://discovery.ucl.ac.uk/id/document/153012> <http://eprints.org/relation/isIndexCodesVersionOf> <https://discovery.ucl.ac.uk/id/document/153007> . <https://discovery.ucl.ac.uk/id/eprint/1472433> 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