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Collaborative Studies of Proton Induced Multiple Ionization and Electron Emission Resulting from Dressed Ion Impact

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Collaborative Studies of Proton Induced Multiple Ionization and Electron Emission Resulting from Dressed Ion Impact Abstract Number: D1/1-01 COLLABORATIVE STUDIES OF PROTON INDUCED MULTIPLE IONIZATION AND ELECTRON EMISSION RESULTING FROM DRESSED ION IMPACT Robert Dubois Missouri University of Science and Technology, Rolla, USA [email protected] During a several decade collaboration between S.T. Manson and R.D. DuBois and coworkers, a series of papers concerned with multiple ionization mechanisms in proton-atom collisions and with electron emission resulting from dressed ion impact were published. This talk will briefly discuss the major findings of these studies. Abstract Number: D1/2-02 SPECTROSCOPY AND DYNAMICS OF RARE-GAS ATOMS IN THE HARD X-RAY DOMAIN Maria Piancastelli Uppsala University, Uppsala, Sweden [email protected] Sorbonne Université, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, LCPMR, Paris, France and Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden The possibility of conducting hard x-ray photoexcitation and photoionization experiments under state-of-the art conditions in terms of photon and electron kinetic energy resolution has become available only in the last few years at selected synchrotron radiation facilities, in particular at the GALAXIES beam line operational at the French synchrotron SOLEIL. Some significant examples of recent developments in spectroscopy and dynamics of isolated atoms in the hard x-ray regime will be presented, including recoil phenomena, post-collision interaction effects, double-core-hole formation, and nonstatistical ratio of spin-orbit split components (the latter in collaboration with S.T.Manson). Abstract Number: D1/3-03 A STUDY OF THE NEAR THRESHOLD REGION FOR DOUBLE PHOTOIONIZATION OF ATOMIC OXYGEN Wayne Stolte Lawrence Berkeley National Laboratory, USA [email protected] A joint experimental and theoretical investigation on oxygen double photoionization — the emission of two electrons from atomic oxygen following single photon absorption. High- resolution experimental measurements were performed at the Advanced Light Source, revealing sharp resonance structure superimposed on the more familiar Wannier-like, nearly-linear back- ground. These resonance features are attributed to ionization-plus-excitation Feshbach-resonances embedded in the double ionization continuum. Abstract Number: D1/4-04 K-SHELL FLUORESCENCE YIELD AND PHOTOABSORPTION CALCULATIONS* M. Fatih Hasoglu Hasan Kalyoncu University, Turkey [email protected] Fluorescence yields are important for determining charge-state distributions following K-shell excitation and/or ionization, as is the competing Auger yield. We have shown that the inclusion of higher-order effects often gives results that differ considerably from the commonly-used data, highlighting the inadequacy of the commonly-used configuration-averaged approximation, and providing more reliable data for astrophysical plasma modeling. K-shell photoabsorption calculations are equally as important for a variety of astrophysical processes, in particular, for determining the elemental abundances in the interstellar medium (ISM) from observed X-ray absorption spectra. Photoabsorption cross sections for the isonuclear C - C3+ ions were computed and compared to experimental 1s → 2p, 3p. These benchmarked cross sections were then used to model the Chandra X-ray absorption spectrum of the blazar Mkn 421 near the carbon K-edge, thereby obtaining instrumental and interstellar carbon ion abundances. Ongoing work on neutral and ionic Si, and the latest interpretations for silicon abundance in the ISM, will be discussed. *In addition to their coauthorship of ten refereed publications over the past fifteen years, Steven Manson mentored M. Fatih Hasoglu as an external doctoral thesis committee member and then as a postdoctoral research advisor. Abstract Number: D1/5-05 COINCIDENCE PHOTOELECTRON MEASUREMENTS FOLLOWING 2P PHOTOIONIZATION IN MG Emma Sokell University College Dublin, Ireland [email protected] Coincidence measurements, where the photoelectron and the Auger electron arising from the creation and decay of a 2p3/2 vacancy are detected in coincidence, have been carried out at a range of photon energies above the 2p photoionization threshold in magnesium. Triple differential cross- section (TDCS) measurements were made, by determining both the energy and the angle of emission of the two electrons. Three TDCS measurements were obtained at each of the photon energies investigated and these data fit simultaneously using the two-step model presented by Schmidt [1]. The fitting provided information about the dipole matrix elements for the process, which were compared with the results of Relativistic Random Phase Approximation calculations for all of the photon energies studied. [1] Schmidt V 1997 Electron Spectrometry of Atoms using Synchrotron Radiation, Cambridge Monographs on Atomic, Molecular and Chemical Physics. Cambridge University Press. Abstract Number: D1/6-06 FROM NON-DIPOLE EFFECTS TO ELECTRON-ION COINCIDENCE SPECTROSCOPY Daniel Rolles Kansas State University, Manhattan, USA [email protected] Abstract will be added shortly Abstract Number: D1/7-07 RESONANT INNER-SHELL EXCITATION DRIVES NUCLEAR DYNAMICS IN CYCLOPROPANE Stacey Sorensen Lund University, Sweden [email protected] Selective excitation of valence states near the carbon 1s ionization threshold in the cyclic (triangular) cyclopropane molecule leads to an evolution of the cyclic structure which depends upon the nature of the core-excited state. The experimental data is presented and preliminary calculations support interpretation of the coincidence ion-imaging data. Abstract Number: D2/1-08 ENERGY AND TIME RESOLUTION IN ATOMIC PROCESSES A. Ravi P. Rau Louisiana State University, USA [email protected] Quantum physics brought to the fore a conjugate relationship between energy and time in physical systems and phenomena. They afford alternative representations of the same physics. Both experimental observation and theoretical calculation can work with either high energy resolution or very short time-scale treatment, technology often the determinant on what is feasible or convenient. Examples in photoabsorption in atoms over the last sixty years of Steve Manson's contributions to the field will be discussed. Abstract Number: D2/2-09 FANO LINESHAPE PHYSICS IN THE TIME DOMAIN Chris Greene Purdue University [email protected] The renowned Fano lineshape that arises when a bound state is coupled to a continuum can display an asymmetrical profile when an observable is plotted versus frequency or energy Such lineshapes are often referred to as "Fano profiles", where the asymmetry is controlled by a parameter q in the standard notation used for the energy dependence. What is less familiar is that excitation of such a resonance by a very fast and short laser pulse can induce an oscillating dipole moment whose phase exhibits a very simple dependence on the Fano lineshape asymmetry parameter q. This talk will discuss the physics behind this simple relationship, and its experimental observation by Christian Ott, Thomas Pfeifer, and their collaborators in laser excitation processes in atomic helium. Abstract Number: D2/3-10 GENERATION OF GIGAWATT ISOLATED ATTOSECOND PULSES BY HIGH-ENERGY OPTICAL WAVEFORM SYNTHESIZE Katsumi Midorikawa RIKEN Tokyo, Japan [email protected] By innovatively introducing multicycle pulse synthesis strategy and combining the waveform synthesizer and the loose-focusing method for HHG, a shot-to-shot- reproducible high-energy XUV continuum supporting the generation of isolated attosecond pulses is achieved. The peak power of this continuum is evaluated to be beyond 1 GW with a170-as transform limit duration. We also discuss the extension of this scheme for generating high-energy isolated attosecond pulses beyond the carbon K-edge. Abstract Number: D2/4-11 PHOTOINDUCED ULTRAFAST PROCESSES IN ATOMS AND FULLERENES Himadri Chakraborty Northwest Missouri State University [email protected] The talk will begin highlighting Steve Manson’s contributions in the domain of attosecond time- delay studies in the field of photoionization of confined atoms based on the framework of the classic Wigner-Smith formalism. The discussions will then drive into the domain of our group’s research in the same topic while applying different formalisms and modelling. A link between the two domains will be my longtime collaboration with Steve. The second part of the talk will focus on the ultrafast electron-phonon coupled relaxation dynamics following surgical photoexcitations in atomic endofullerene molecules. Such nonadiabatic relaxation is a key process in organic photovoltaics, whose donor-acceptor complexes predominantly base on fullerene materials. I will present some selected recent results on the charge transfer forming non-local excitons within these molecules and a novel phenomenon of transient electron trapping along the decay path. Abstract Number: D2/5-12 USING CIRCULAR DICHROISM TO CONTROL ENERGY TRANSFER IN MULTI-PHOTON IONIZATION Klaus Bartschat Drake University, Des Moines, Iowa, USA [email protected] Chirality causes symmetry breaks in a large variety of natural phenomena ranging from particle physics to biochemistry. I will report on a joint experimental and theoretical project [1], in which we investigate one of the simplest conceivable chiral systems, a laser-excited, oriented Li target. Prepared in a polarized (2p, m=+1) state in an optical trap, the atoms are exposed to co- and counter-rotating circularly
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