Bulletin of the American Physical Society
2006 37th Meeting of the Division of Atomic, Molecular and Optical Physics
Tuesday–Saturday, May 16–20, 2006; Knoxville, TN
Session N2: Particle-Induced Ionization and Break-up Processes of Atoms and Molecules |
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Chair: Itzik Ben-Itzak, Kansas State University Room: Knoxville Convention Center Ballroom EFG |
Thursday, May 18, 2006 1:30PM - 2:06PM |
N2.00001: Recent progress in modeling the electron-impact ionization of atoms. Invited Speaker: After several decades of relatively slow progress in modelling the details of the ionization process for electron impact collisions on atoms, very rapid developments have occurred over the past decade in solving the non- relativistic Schroedinger equation for one- and two-electron atoms. This presentation will highlight the critical steps in our increasing knowledge and attempt ~a (somewhat speculative) forecast for future progress in accurate computation of the ionization process for more complex atomic targets. [Preview Abstract] |
Thursday, May 18, 2006 2:06PM - 2:42PM |
N2.00002: Electron and Photon Impact Ionization: Extracting Fundamental Quantities From Experiment Invited Speaker: Electron impact ionization and photoionization have a lot in common for high incident electron energy and low photon energy. In both cases the atomic ionization process can be expressed in terms of a very truncated multipole expansion. The two ionization processes will be compared and experiments for both will be described that enable the measurement of the relative magnitudes and phases of the multipole amplitudes. The key to the technique is the use of autoionizing levels to introduce a known energy dependent magnitude and phase modulation. [Preview Abstract] |
Thursday, May 18, 2006 2:42PM - 3:18PM |
N2.00003: Three-Dimensional Imaging of Atomic Fragmentation Processes Invited Speaker: Michael Schulz Fully differential studies on atomic reaction dynamics are crucially important to advance our understanding of the few-body problem. In the case of electron impact, fully differential cross sections for single ionization have been measured for several decades. The vast majority of these studies were restricted to electrons ejected into specific planes. More importantly, for ion impact such experiments are much more challenging and fully differential cross sections (FDCS) became only available a few years ago. However, at the same time these measurements for ion impact also yielded the first complete three-dimensional images of the FDCS. The sobering conclusion of these studies was that our understanding of ionization processes in atomic collisions is much less complete than assumed previously. In this talk new unexpected results on three-dimensional FDCS will be presented for kinematic regimes for which so far no experimental FDCS have been obtained yet. These include collisions involving highly relativistic and highly charged ions as well as relatively slow p projectiles. [Preview Abstract] |
Thursday, May 18, 2006 3:18PM - 3:54PM |
N2.00004: Novel Studies of Electron-Impact Induced Ionization of Atoms and Molecules Invited Speaker: Reaction microscopes allow to measure the momentum vectors of all fragments produced in ionization processes. We have developed such a multi-particle spectrometer for the investigation of electron scattering processes in the low to medium energy range. Here studies of fundamental few-body reactions will be presented which have not been feasible before. For single ionization of helium by fast (E = 1000 eV) and by slow (E = 105 eV) electron-impact the three-dimensional electron emission patterns show structures which, so far, are not understood and which have not been observed in conventional experiments. Kinematically complete experiments for double ionization of helium by electrons with an energy (E = 106 eV) close to the threshold enable for the first time a detailed insight into the behaviour of three strongly interacting continuum electrons in the field of the residual ion. Finally we present results for single ionization of H$_{2}$ molecules where the dependence of the ionization dynamics from the alignment of the molecular axis with respect to the incoming projectile beam is studied. [Preview Abstract] |
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