FIAS Scientific Report 2011 - Frankfurt Institute for Advanced Studies ...

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Photo-processes in clusters Collaborators: A.V. Solov’yov 1 , A.V. Korol 1 , A.V. Verkhovtsev 1 , R.G. Polozkov 2 , V.K. Ivanov 2 , J.-P. Connerade 3 , A. Müller 4 1 Frankfurt Institute for Advanced Studies, 2 St. Petersburg State Polytechnic University, Russia, 3 Imperial College, London, UK, 4 Justus-Liebig-Universität Giessen, Germany Short description: We study photo-processes (photoabsorption, bremsstrahlung, light scattering) in nanostructures. Special attention is paid to the role of collective electron excitations (plasmons) and mechanisms of their relaxation. Main results: A consistent many-body theory based on the jellium model has been applied recently for description of angular resolved photoelectron spectra of metal clusters anions Na − 7 and Na− 19 (R.G. Polozkov, V.K. Ivanov, A.V. Solov’yov, Many-body theory for angular resolved photoelectron spectra of metal clusters, Phys. Rev. A81, 021202 (2010)). In [1] we investigated the medium size sodium cluster, Na − 57 . The angular asymmetry parameter β was calculated within the single-particle Hartree-Fock (HF) approximation as well as with an account for many-electron correlations within the random phase approximation with exchange (RPAE). Both theoretical results were also compared with experimental data (von Issendorff et al., Science 323, 1323 (2009)). It was shown that the account for many-electron correlation leads to a good agreement with the experimental data. Related publications in 2011: � �� Figure: Angular anisotropy parameter β for the partial photionization cross section of Na− 57 versus photoelectron energy. Experimental data from von Issendorff et al. (2009). 1. V.K. Ivanov, R.G. Polozkov, A.V. Verkhovtsev, A.V. Korol, A.V. Solov’yov, Photoionization processes with negative ions of atomic clusters, Abstracts of the Fifth International Symposium ’Atomic Cluster Collisions (ISACC 2011)’ Book of Abstracts, p.44 (Berlin, Germany, July 20-25, 2011). 98 � �
Photo-processes in fullerenes and endohedral systems Collaborators: A.V. Solov’yov 1 , A.V. Korol 1 , A.V. Verkhovtsev 1 , R.G. Polozkov 2 , V.K. Ivanov 2 , J.-P. Connerade 3 , A. Müller 4 1 Frankfurt Institute for Advanced Studies, 2 St. Petersburg State Polytechnic University, Russia, 3 Imperial College, London, UK, 4 Justus-Liebig-Universität Giessen, Germany Short description: Within this project we study photo-processes (photoabsorption, bremsstrahlung, light scattering) in pristine and endohedral fullerenes. Special attention is paid to the influence of the fullerene on the encaged atom (molecule). Main results: We demonstrated, that the Auger decay rate in an endohedral atom is very sensitive to its location in the fullerene cage. Two additional decay channels appear in an endohedral system: (a) the one due to the change in the electric field at the atom caused by dynamic polarization of the fullerene electron shell by the Coulomb field of the vacancy, (b) the channel within which the released energy is transferred to the fullerene electron via the Coulomb interaction. The relative magnitudes of the correction terms are dependent not only on the position of the doped atom but also on the transition energy. Additional enhancement of the decay rate appears for transitions whose energies are in the vicinity of the fullerene surface plasmons energies of high multipolarity. It is demonstrated that in many cases the additional channels can dominate over the direct Auger decay resulting in pronounced broadening of the atomic emission lines. The case study, carried out for Sc 2+ @C80 (see Fig. 1), shows that narrow autoionizing resonances in an isolated Sc 2+ are dramatically broadened if the ion is located strongly off-the-center. Using the developed model we carried out quantitative analysis of the photoionization spectrum for the endohedral complex Sc3N@C80 and demonstrate that the additional channels are partly responsible for the strong modification of the photoionization spectrum profile detected experimentally by Müller et al., J. Phys.: Conf. Ser. 88, 012038 (2007) (see Fig. 2). Figure 3: The structure of the Sc3N@C80 complex. Related publications in 2011: Photoionization cross section (Mb) 60 40 20 0 + Sc N@C 3 80 35 exp. (Mueller et al., 2007) theory (Korol & Solov’yov, 2010) 40 Photon energy (eV) 45 Figure 2: Photoionization of Sc3N@C80: Experiment (Müller et al., 2007) vs theory [1]. 1. A.V. Korol, A.V. Solov’yov, Vacancy decay in endohedral atoms: The role of an atom’s non-central position, J. Phys. B: At., Mol., Opt. Phys. 45, 085001 (1-17) (2011). 99
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FIAS Scientific Report 2011
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FIAS Scientific Report 2011 Table o
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Physics Research highlights 2011 To
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1. Partner Research Centers 9
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ExtreMe Matter Institute EMMI by Ca
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Bernstein Focus Neurotechnology Fra
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2. Graduate Schools 15
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participants reported on their proj
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Courses offered at FIGSS Summer Sem
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3. FIAS Scientific Life 21
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28.07.2011 Prof. Dr. Victor Flambau
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Conferences and meetings (co)organi
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4. Research Reports 4.1 Nuclear Phy
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Hydrodynamics of a quark droplet Co
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Production of hyper-nuclei in react
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On production and properties of mul
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Monte Carlo modeling microdosimetry
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Monte Carlo simulation of the spall
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Dimuon radiation within a (3+1)d hy
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Initial state anisotropies and thei
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Chiral hadronic model including res
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Trace anomaly and the vector coupli
Page 47 and 48: Dileptons from the strongly interac
Page 49 and 50: Space-time evolution of the magneti
Page 51 and 52: Extreme isospin in heavy nuclei Col
Page 53 and 54: Production of heavy and superheavy
Page 55 and 56: The phase diagram in T -µB-Nc spac
Page 57 and 58: Critical Zeeman Fields for Unitary
Page 59 and 60: BCS-BEC Crossover in 2D Fermi Gases
Page 61 and 62: Applications of a chiral SU(3) mode
Page 63 and 64: The phase diagram of black holes in
Page 65 and 66: Black holes in short scale modified
Page 67 and 68: Fractal dimensions and micro-struct
Page 69 and 70: Untangling the interactions between
Page 71 and 72: Stimulus information coded by spike
Page 73 and 74: Non-stationarity of neuronal activi
Page 75 and 76: Timescale of information processing
Page 77 and 78: Discovery of agency in 6 and 8-mont
Page 79 and 80: Power spectra of the natural input
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Page 83 and 84: Learning mechanisms underlying visu
Page 85 and 86: Emerging Bayesian priors in a self-
Page 87 and 88: Non-linear generative models and th
Page 89 and 90: Preference elicitation and Bayesian
Page 91 and 92: 4.3 Biology, Chemistry, Molecules,
Page 93 and 94: DNA unzipping Collaborators: S.N. V
Page 95 and 96: Statistical mechanics of protein fo
Page 97: Phase transitions in large clusters
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Page 103 and 104: Novel light sources: Crystalline un
Page 105 and 106: Monte-Carlo code for channeling dyn
Page 107 and 108: Programs for many-body descriptions
Page 109 and 110: Are 12 C radiation effects in liver
Page 111 and 112: Objective identification of residue
Page 113 and 114: Structural basis for the dual RNA-r
Page 115 and 116: The ALICE High Level Trigger Collab
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FIAS publications 2011 - Patents 24
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The success of FIAS would not have
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