Calendar of Physics Talks Vienna

Die Lindblad-Gleichung
Speaker:Bernhard Baumgartner (Fakultät für Physik)
Abstract:im Rahmen des Seminars für Mathematische Physik
Date: Tue, 04.10.2011
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:J. Yngvason

Fast Charge Breeding of short-lived Isotopes in an Electron Beam Ion Trap for Precision Mass Measurements at TRIUMF
Speaker:Dr. Martin Simon (TRIUMF, TITAN Canada’s National Laboratory for Particle and Nuclear Physics, Vancouver/Canada)
Abstract:At Canada’s National Laboratory for Particle and Nuclear Physics (TRIUMF), the TITAN facility (TRIUMF’s Ion Traps for Atomic and Nuclear science) is dedicated to high precision experiments on rare isotopes with a focus on mass measurements in a Penning trap [1]. Isotopes of special interest are often located close to the proton or neutron drip line where short life times (tens of milliseconds) and low production rates make it challenging to achieve the required precision. Breeding the ions to higher charge states (q) leads to a boost in precision of the mass measurement by a factor of q provided that the processes of injection, breeding, and extraction are fast and efficient. These two conditions are well met by electron beam ion traps (EBITs). For instance, the masses of neutron deficient 74Rb8+ and neutron rich 98Rb15+ with life times of 65ms and 114ms, respectively, have been successfully measured. Recently more efficient breeding procedures based on accumulation of ions in a charge state which corresponds to an atomic shell closure have been applied.
Date: Tue, 04.10.2011
Time: 16:00
Location:Technische Universität Wien, Institut für Angewandte Physik, Seminarraum 134A, Turm B (gelbe Leitfarbe), 5. OG, 1040 Wien, Wiedner Hauptstraße 8-10
Contact:Ao.Univ.Prof. Dr. Friedrich Aumayr

The Frobenius group T7 as a symmetry group of the lepton sector
Speaker:Ulrike Regner (Fakultät für Physik)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Thu, 06.10.2011
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:W. Grimus

Asymptotically flat vacuum spacetimes with complete smooth light cones
Speaker:Tim-Torben Paetz (Univ.Wien) (Fakultät für Physik)
Abstract:im Rahmen des Literaturseminars
Date: Thu, 06.10.2011
Time: 14:15
Duration: 60 min
Location:Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock
Contact:R. Beig

Extreme control over electrons in space and time
Speaker:Peter HOMMELHOFF (Max Planck Institut für Quantenoptik, Garching)
Abstract:In free space, slow electrons are notoriously hard to control because of their large charge to mass ratio. We will report on two experiments where we utilize electric fields to confine and steer electrons. The one experiment centers on microwave fields to guide electrons in microfabricated Paul traps, aiming at low-energy guided electron interferometry [1]. The other experiment deals with sharp tips from which we emit electrons with optical fields, namely with few-cycle laser pulses, and show that electrons can be steered by the optical electric fields [2]. We observe matter-wave interference of electrons that undergo re-scattering with the parent tip in subsequent laser cycles [3]. We have hence achieved attosecond control over electrons in a nanoscale solid-state system, opening the field of lightwave electronics. [1] J. Hoffrogge et al., PRL 106, 193001 (2011) [2] M. Schenk et al., PRL 105, 257601 (2010) [3] M. Krüger et al., Nature 475, 78 (2011)
Date: Fri, 07.10.2011
Time: 15:30
Location:Atominstitut, Hörsaal
Contact:J. Schmiedmayer