Bulletin of the American Physical Society
38th Annual Meeting of the Division of Atomic, Molecular, and Optical Physics
Volume 52, Number 7
Tuesday–Saturday, June 5–9, 2007; Calgary, Alberta, Canada
Session N3: Fully-Differential Studies of Atomic Few-Body Problems |
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Chair: M. Schulz, University of Missouri-Rolla Room: TELUS Convention Centre Macleod B |
Friday, June 8, 2007 8:00AM - 8:36AM |
N3.00001: Recent Theoretical Progress for Treating Charged Particle Ionization of Atoms and Molecules Invited Speaker: The field of atomic and molecular ionization by charged particle impact has seen exciting advances over the last few years as a result of the development of the COLTRIMS method. Using COLTRIMS, one can get three-dimensional fully differential cross sections (FDCS) for essentially any projectile and any target. This work complements the results of more conventional spectrometers which means that we are getting a much clearer picture of the ionization process. As a result of the rapid experimental advances, the theoretical models are being more stringently tested. This talk will examine the theoretical advances that have been made in the last few years for light and heavy particle ionization of atoms and molecules. [Preview Abstract] |
Friday, June 8, 2007 8:36AM - 9:12AM |
N3.00002: Interference, Correlation and Entanglement in Molecular Double Ionization Invited Speaker: Photoionization of a diatomic resembles the situation of a traditional double slit. We present a series of experiments on double ionization of H$_2$, where we find evidence of this diffraction pattern in the angular distribution of the electrons in the molecular fixed frame. This interference is gradually lost as the momentum exchange of the electrons is increased, illustrating the transition from quantum to classical behavior. We show that the quantum interence is buried in the entangeld two body wavefunction and can be unraveled by imaging the full correlated multipartical final state phase space. [Preview Abstract] |
Friday, June 8, 2007 9:12AM - 9:48AM |
N3.00003: Differential cross sections for the photoionization of two-electron systems Invited Speaker: The time-dependent close-coupling approach has recently been used to compute fully differential cross sections for various electron- and photon-impact ionization processes of light atoms and molecules, including the double photoionization of He and Be and the electron-impact ionization of H and He. This talk will give a review of these recent developments and present our latest calculations, including the triple differential cross sections arising from the double photoionization of the H$_2$ molecule. Our calculations using the time-dependent close-coupling method are found to be in excellent agreement with recent measurements and other non-perturbative calculations. [Preview Abstract] |
Friday, June 8, 2007 9:48AM - 10:24AM |
N3.00004: Fully Differential Studies on Atomic Few Body Problems Invited Speaker: Within the last few years, using many-particle imaging techniques (so called reaction microscopes or COLTRIMS spectrometer), numerous fully differential studies of atomic break-up reactions induced by single photon impact, intense laser pulses in the optical and VUV (FEL pulses) as well as by electron and ion impact have been performed. The results of a few selected examples will be discussed during the talk with special emphasis on single ionization of atoms by fast ion impact, a subject that has been studied extensively over decades but measurements of fully differential cross sections (FDCS) were not possible before the advent of reaction microscopes. Such FDCS data are known to be very sensitive to the collision dynamics and they can be considered as the ultimate test of single ionization theories. Recent results for ionization of He in collisions with various projectiles over a wide range of perturbation strengths Z/v (projectile charge to velocity ratio) from Z/v = 0.1 up to 4.4 reveal significant discrepancies between theory and experiment. The experimental results are discussed in terms of possible higher order ionization mechanisms which are not taken into account in theory. In addition, the possible influences of experimental uncertainties, not considered in most of the theoretical models, will be discussed. [Preview Abstract] |
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