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Stoehlker, T.; Ludziejewski, T.; Reich, H.; Bosch, F.; Franzke, B.; Kozhuharov, C.; Menzel, G.; Mokler, P.H.; Nolden, F.; Steck, M.; Stachura, Z.; Swiat, P.; Warczak, A.
Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany)1998
Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany)1998
AbstractAbstract
[en] Charge-exchange cross sections and beam lifetimes are studied for decelerated bare uranium ions at the ESR storage ring. By deceleration from the initial energy of 358 MeV/u down to various energies as low as 49 MeV/u, i.e. far below the production energy of bare ionic species, the electron pick-up cross sections were obtained for collisions with N2, Ar, CH4 and Kr gaseous targets. The measured cross sections and beam lifetimes are compared with the theoretical results for radiative and non-radiative electron capture. The present data along with the theoretical approximations discussed, provide a solid basis for the estimation of beam lifetimes for decelerated bare high-Z ions. Moreover, a normalization procedure is proposed, in which absolute total charge-exchange cross sections are derived by normalizing the simultaneously measured yield of K-REC photons to rigorously calculated relativistic cross sections. This method along with the unprecedented beam conditions at the ESR storage ring, allows a significant improvement in the accuracy of cross section data. (orig.)
Primary Subject
Source
Aug 1998; 23 p
Record Type
Report
Literature Type
Numerical Data
Report Number
Country of publication
ARGON, CHARGE EXCHANGE, DIFFERENTIAL CROSS SECTIONS, ELECTRON CAPTURE, ENERGY SPECTRA, ESR STORAGE RING, EXCITATION FUNCTIONS, EXPERIMENTAL DATA, GEV RANGE 01-10, GEV RANGE 10-100, INTEGRAL CROSS SECTIONS, ION-ATOM COLLISIONS, ION-MOLECULE COLLISIONS, KRYPTON, METHANE, MULTICHARGED IONS, NITROGEN, RELATIVISTIC RANGE, URANIUM 238 BEAMS, URANIUM IONS, X-RAY SPECTRA
ALKANES, ATOM COLLISIONS, BEAMS, CAPTURE, CHARGED PARTICLES, COLLISIONS, CROSS SECTIONS, DATA, ELEMENTS, ENERGY RANGE, GEV RANGE, HYDROCARBONS, INFORMATION, ION BEAMS, ION COLLISIONS, IONS, MOLECULE COLLISIONS, NONMETALS, NUMERICAL DATA, ORGANIC COMPOUNDS, RADIOACTIVE ION BEAMS, RARE GASES, SPECTRA, STORAGE RINGS
Reference NumberReference Number
INIS VolumeINIS Volume
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Stephens, J.A.
Atomic and Molecular Data Unit, Nuclear Data Section, International Atomic Energy Agency, Vienna (Austria)1998
Atomic and Molecular Data Unit, Nuclear Data Section, International Atomic Energy Agency, Vienna (Austria)1998
AbstractAbstract
[en] This bulletin is published by the International Atomic Energy Agency to provide atomic and molecular data relevant to fusion research and technology. In the first part the indexed papers are listed separately for (i) structure and spectra (energy levels, wavelengths, transition probabilities, oscillator strengths, polarizabilities, electric moments, interatomic potentials), (ii) atomic and molecular collisions (photon collisions, electron collisions, heavy-particle collisions), and (iii) surface interactions (sputtering, chemical reactions, trapping and detrapping, adsorption, desorption, reflection, and secondary electron emission). There are also chapters with beam-matter interactions and data on interactions of atomic particles with fields. In the second Part contains the bibliographic data, essentially for the above listed topics
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Source
Dec 1998; 257 p; ISSN 0258-8048; 

Record Type
Report
Literature Type
Numerical Data; Bibliography
Report Number
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Kelley, M.H.; McClelland, J.J.
National Inst. of Standards and Technology (NML), Gaithersburg, MD (United States). Electron and Optical Physics Div. Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1998
National Inst. of Standards and Technology (NML), Gaithersburg, MD (United States). Electron and Optical Physics Div. Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1998
AbstractAbstract
[en] As stated in the original proposal, the goal of the project has been to perform electron-scattering experiments on a few model systems with emphasis on resolving all the quantum-state variables possible. The purpose of these experimental studies has been to provide a set of measurements of unprecedented accuracy and completeness that can be used as benchmarks for comparison with theoretical calculations. During the period covered by this report, the work has concentrated on measuring low-energy electron scattering from sodium and chromium. Sodium provides an ideal one-electron test case, since it has a single loosely bound valence electron, making it approachable by even the most complex electron scattering calculations. In addition, the atom has a strong optical transition from the 32S1/2 ground state to the 32P3/2 excited state whose wavelength (589 nm) matches the peak output of the laser dye rhodamine 6G. Thus optical pumping techniques can be readily applied in the laboratory, leading to either a population of ground state atoms in which the spin of the valence electron is oriented either up or down in the laboratory, or a spin polarized pure angular momentum state of the excited 32P3/2 state. Such an excited state makes possible superelastic scattering, where the internal energy of the atom is transferred to the electron during the collision. This turns out to be a very efficient way to study the inelastic scattering process. Unlike sodium, chromium provides an extremely exacting test for theoretical methods because of its very complex electronic structure, not because it is simple. With a valence configuration consisting of five electrons in a half-filled 3d shell, plus another electron in a 4s shell, this atom provides a test case that can challenge even the simplest approximations
Primary Subject
Source
15 Mar 1998; 12 p; CONTRACT AI05-91ER14184; ALSO AVAILABLE FROM OSTI AS DE98003435; NTIS; INIS; US GOVT. PRINTING OFFICE DEP
Record Type
Report
Literature Type
Progress Report
Report Number
Country of publication
Reference NumberReference Number
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INIS IssueINIS Issue
Poirier, L.W.
Lawrence Berkeley National Lab., CA (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1997
Lawrence Berkeley National Lab., CA (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1997
AbstractAbstract
[en] A new methodology is proposed for the efficient determination of Green's functions and eigenstates for quantum systems of two or more dimensions. For a given Hamiltonian, the best possible separable approximation is obtained from the set of all Hilbert space operators. It is shown that this determination itself, as well as the solution of the resultant approximation, are problems of reduced dimensionality for most systems of physical interest. Moreover, the approximate eigenstates constitute the optimal separable basis, in the sense of self-consistent field theory. These distorted waves give rise to a Born series with optimized convergence properties. Analytical results are presented for an application of the method to the two-dimensional shifted harmonic oscillator system. The primary interest however, is quantum reactive scattering in molecular systems. For numerical calculations, the use of distorted waves corresponds to numerical preconditioning. The new methodology therefore gives rise to an optimized preconditioning scheme for the efficient calculation of reactive and inelastic scattering amplitudes, especially at intermediate energies. This scheme is particularly suited to discrete variable representations (DVR's) and iterative sparse matrix methods commonly employed in such calculations. State to state and cumulative reactive scattering results obtained via the optimized preconditioner are presented for the two-dimensional collinear H + H2 → H2 + H system. Computational time and memory requirements for this system are drastically reduced in comparison with other methods, and results are obtained for previously prohibitive energy regimes
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Dec 1997; 150 p; CONTRACT AC03-76SF00098; ALSO AVAILABLE FROM OSTI AS DE98052319; NTIS; INIS; US GOVT. PRINTING OFFICE DEP; Thesis (Ph.D.)
Record Type
Report
Literature Type
Thesis/Dissertation
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Country of publication
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INIS IssueINIS Issue
McCarthy, K.J.; Zurro, B.
Abstracts of the 23rd European physical society conference on controlled fusion and plasma physics1996
Abstracts of the 23rd European physical society conference on controlled fusion and plasma physics1996
AbstractAbstract
No abstract available
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Secondary Subject
Source
Goutych, I.F.; Gresillon, D.; Sitenko, A.G.; AN Ukrainskoj SSR, Kiev (Ukraine). Inst. Teoreticheskoj Fiziki; 488 p; 1996; p. 352; 23. European physical society conference on controlled fusion and plasma physics; Kyiv (Ukraine); 24-28 Jun 1996
Record Type
Miscellaneous
Literature Type
Conference
Report Number
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Trajmar, S.; Kanik, I.; LeClair, L.R.; Khakoo, M.A.; Bray, I.; Fursa, D.; Csanak, G.
Proceedings of the Japan-US workshop on plasma polarization spectroscopy and the international seminar on plasma polarization spectroscopy1998
Proceedings of the Japan-US workshop on plasma polarization spectroscopy and the international seminar on plasma polarization spectroscopy1998
AbstractAbstract
[en] We describe some of our results from a joint experimental and theoretical program concerning elastic electron scattering by 138Ba(...6s6p 1P1) atoms. From the experimental results, we derived various scattering parameters and magnetic sublevel specific differential elastic scattering cross sections at impact energy (E0) of 20.0 eV and at scattering angles (θ) of 10deg, 15deg, and 20deg. The same parameters and cross sections were calculated by the convergent close coupling (CCC) approximation and compared to the experimental results. An excellent agreement, found for the two sets of data, gave us confidence in the CCC method and allowed us to extend the angular and energy ranges for the purpose of generating integral elastic scattering cross sections needed for the deduction of the alignment creation cross sections. (J.P.N.)
Primary Subject
Source
Fujimoto, Takashi; Beiersdorfer, Peter (eds.); National Inst. for Fusion Science, Nagoya (Japan); 272 p; Jun 1998; p. 216-227; Japan-US workshop on plasma polarization spectroscopy; Kyoto (Japan); 26-28 Jan 1998; International seminar on plasma polarization spectroscopy; Kyoto (Japan); 26-28 Jan 1998
Record Type
Report
Literature Type
Conference
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Reference NumberReference Number
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INIS IssueINIS Issue
Jardin, P.
CEA Saclay, 91 - Gif-sur-Yvette (France). Dept. de Recherche sur l'Etat Condense, les Atomes et les Molecules1995
CEA Saclay, 91 - Gif-sur-Yvette (France). Dept. de Recherche sur l'Etat Condense, les Atomes et les Molecules1995
AbstractAbstract
[en] This work is dedicated to the study of the energy transfer mechanisms which occur during a collision between a swift multicharged heavy ion and a neutral atom. The elementary energy energy transfer mechanisms (scattering, excitation, ionization, capture) and their consequences on the target velocity after the collision (recoil velocity) are recalled in the first chapter. In the case of small projectile diffusion angles, we show that the recoil velocity component, transverse to the incident projectile direction, results principally from the diffusion mechanism, while the longitudinal component is due essentially to the mass transfer and the inelastic energy transfer mechanisms. Since the target recoil velocities are very small, we have built an experimental set-up which reduces the impreciseness on their measurement due to the target thermal spread using, as targets, cooled atoms of a supersonic jet (temperature < 1 K). The association of time of flight and localisation techniques allows us, for each ionised target atom, to determine the three recoil velocity components with a very good accuracy (a few tens of meters per second). In chapter three, we describe the data analysis method. And then we present in the last chapter the results we have obtained for the collision systems Xe44+(6.7 MeV/A) + Ar => Xe44 + Arq++qe- (q ranging from 1 to 7); Xe44+ (6.7 MeV/A) + He => Xe44+ He1+,2++1e-,2e-. We show that it is possible to interpret the recoil velocity in terms of kinetic energy transferred to the target and to the electrons ejected from the target. (author)
Original Title
Etude des mecanismes elementaires de transfert d'energie au cours d'une collision entre un ion lourd rapide multi-charge et un atome neutre
Primary Subject
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Source
1995; 238 p; 44 refs.
Record Type
Report
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Farizon, B.; Farizon, M.; Gaillard, M.J.; Louc, S.; Genre, R.; Martin, J.
Inst. de Physique Nucleaire, Lyon-1 Univ., 69 - Villeurbanne (France); Collaboration: IPN-Lyon, LASIM (Universte Lyon-I), l'Universite Federale de Rio de Janeiro, Universitaet Innsbruck
Report of Activity, 1996 - 19971998
Inst. de Physique Nucleaire, Lyon-1 Univ., 69 - Villeurbanne (France); Collaboration: IPN-Lyon, LASIM (Universte Lyon-I), l'Universite Federale de Rio de Janeiro, Universitaet Innsbruck
Report of Activity, 1996 - 19971998
AbstractAbstract
[en] We study occurrence of a critical behaviour (e.g. a second order phase transition) in the fragmentation of 60 keV/u - H25+ clusters induced by collision on a C60 cluster at high velocity (c/100). It shows a power law falloff with increasing fragment size. The Campi moment analysis shows that cluster fragmentation exhibits a transition characterized by an increase of the fluctuation. In collision with an helium atom, the capture cross section of one electron of the target by the H3+ (H2)(n-3)/2 cluster has been studied with respect to the cluster size (3≤n≤35) at a given velocity. For all the cluster sizes the capture cross sections is equal to the one of H3+ ion. (authors)
Original Title
Fragmentation d'agregats
Primary Subject
Source
Augustin, Jean-Eudes (Inst. de Physique Nucleaire, Lyon-1 Univ., 69 - Villeurbanne (France)); Inst. de Physique Nucleaire, Lyon-1 Univ., 69 - Villeurbanne (France); 159 p; ISSN 0399-8878;
; 1998; p. 80-82; 7 refs., 3 figs.

Record Type
Report
Literature Type
Progress Report
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Senn, G.; Scheier, P.; Maerk, T.D.
46th annual symposium of the Austrian Physical Society. Programme and abstracts1996
46th annual symposium of the Austrian Physical Society. Programme and abstracts1996
AbstractAbstract
No abstract available
Original Title
C6+-Verlust von hochgeladenen Fullerenen
Primary Subject
Secondary Subject
Source
Schindler, H.G. (ed.); Oesterreichische Physikalische Gesellschaft, Vienna (Austria); 218 p; 1996; p. 54; 46. annual symposium of the Austrian Physical Society; 46. Jahrestagung der Oesterreichischen Physikalischen Gesellschaft; Linz (Austria); 23-27 Sep 1996
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Miscellaneous
Literature Type
Conference
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AbstractAbstract
[en] The examination of electron-positron pairs which are emitted in heavy-ion collisions at the Coulomb barrier was continued with the newly designed EPoS II spectrometer at the UNILAC accelerator. The objective of the experiments was to further analyse the narrow line structures in the positron-electron cumulative energy distributions, which were observed in preceding measurements examining the collision systems U 238 + Th 232 and U 238 + Ta181 with the EPOS I spectrometer. By means of a reproduction experiment, the existence of the lines was statistically verified relying on a large data pool
[de]
Die Untersuchung von Elektron- Positron Paaren, die bei Schwerionenkol lisionen an der Coulombbarriere emittiert werden, wurde mit dem neu kon zipierten EPoS II Spektrometer am UNILAC- Beschleuniger fortgesetzt. D ie Motivation der Experimente war die weitere Untersuchung der schmale n Linienstrukturen in den Positron- Elektron- Summenenergieverteilunge n, die in vorangegangenen Messungen der Stosssysteme U 238+ Th 232 un d U 238+ Ta 181 mit dem EPOS I Spektrometer beobachtet wurden. Durch ei ne Reproduktion wurde die Existenz der Linien anhand einer grossen Date nmenge statistisch sicher geprueftOriginal Title
Die Suche nach schmalen e+e- Summenenergieverteilungen in Schwerionenkollisionen. Das GSI e+e--Puzzle
Primary Subject
Secondary Subject
Source
Dec 1995; 137 p; ISSN 0171-4546;
; Diss.

Record Type
Report
Literature Type
Thesis/Dissertation; Numerical Data
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Country of publication
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