title: Photoionization with orbital angular momentum beams.
abstract: Intense laser ionization expands Einstein's photoelectric effect rules giving a wealth of phenomena widely studied over the last decades. In all cases, so far, photons were assumed to carry one unit of angular momentum. However it is now clear that photons can possess extra angular momentum, the orbital angular momentum (OAM), related to their spatial profile. We show a complete description of photoionization by OAM photons, including new selection rules involving more than one unit of angular momentum. We explore theoretically the interaction of a single electron atom located at the center of an intense ultraviolet beam bearing OAM, envisaging new scenarios for quantum optics.
authors.affiliation: Grup d'Optica, Universitat Autónoma de Barcelona, E-08193 Bellaterra (Barcelona), Spain.
authors.forename: A
authors.initials: A
authors.lastname: Picón
authors.forename: J
authors.initials: J
authors.lastname: Mompart
authors.forename: J R Vázquez
authors.initials: JR
authors.lastname: de Aldana
authors.forename: L
authors.initials: L
authors.lastname: Plaja
authors.forename: G F
authors.initials: GF
authors.lastname: Calvo
authors.forename: L
authors.initials: L
authors.lastname: Roso
mesh_terms: D003198:Computer Simulation; D004583:Electrons; D004735:Energy Transfer; D007477:Ions; D008962:Models, Theoretical; D017785:Photons; D011789:Quantum Theory
chemical_list: D007477:Ions