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in subjects: "Electron Capture"  
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Autoionization of Be-like ions following double electron capture in C sup 4+ , O sup 6+ and Ne sup 8+ ions

Description: This paper describes electron emission following the autoionization of doubly excited states in Be-like ions. The Be-like Auger states are produced by two electron capture in slow C{sup 4+}, O{sup 6+} and Ne{sup 8+} ions. These measurements were performed by means of high resolution Auger electron spectroscopy on different target gases and at different projectile energies. Line assignments and relative cross sections are given for the investigated doubly excited states and the excitation mechan… more
Date: September 11, 1990
Creator: McDonald, J.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Newly appreciated roles for electrons in ion-atom collisions

Description: Since the previous Debrecen workshop on High-Energy Ion-Atom Collisions there have been numerous experiments and substantial theoretical developments in the fields of fast ion-atom and ion- solid collisions concerned with explicating the previously largely underappreciated role of electrons as ionizing and exciting agents in such collisions. Examples to be discussed include the double electron ionization problem in He; transfer ionization by protons in He; double excitation in He; backward scat… more
Date: January 1, 1990
Creator: Sellin, I.A. (Tennessee Univ., Knoxville, TN (USA). Dept. of Physics and Astronomy Oak Ridge National Lab., TN (USA))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experimental investigations of electron capture from atomic hydrogen and deuterium by alpha particles

Description: We have undertaken a program at the University of Missouri-Rolla to experimentally determine cross sections for ion-atom collisions of interest in fusion reactor development. During the last grant period, we have made measurements of total and singly-differential cross sections for the alpha double-capture reaction. He{sup ++} + He(ls{sup 2}) {yields} He({Sigma}n,{ell}) + He{sup ++}. Collisions of this type have been discussed as a basis for diagnostics in which alphas are neutralized in a sing… more
Date: January 1, 1990
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Angular distributions of single- and double-electron capture in very-slow Ar sup 6+ -Ar collisions

Description: We have measured state-resolved angular distributions of one- and two-electron capture in 32 to 800 eV Ar{sup 6+} {minus} Ar collisions. The experimental energy-gain spectra show that single-electron capture mainly populates the 5s, 5p and 4f levels. We observe detailed structures in the corresponding angular distributions, but a final interpretation has to await a quantitative analysis of the collision dynamics. We tentatively ascribe the main features in the angular distribution of true doubl… more
Date: 1990~
Creator: Biedermann, C.; Levin, J. C.; Short, R. T.; Elston, S. B.; Gibbons, J. P.; Kimura, K. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Dielectronic recombination into Rydberg levels of lithiumlike titanium

Description: To characterize line formation near threshold for electron-impact excitation, dielectronic capture into high-n levels in lithiumlike Ti{sup 19+} ions has been studied with high-resolution x-ray spectroscopy on the Livermore electron beam ion trap. The process is shown to result in satellite lines which are virtually indistinguishable from their dipole-allowed heliumlike parent lines. High-n satellite lines are absent from dipole-forbidden heliumlike lines.
Date: October 10, 1990
Creator: Beiersdorfer, P.; Chantrenne, S.; Chen, M. H.; Marrs, R. E.; Vogel, D. A.; Wong, K. L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Coincidence Measurements of Electron Capture and Loss in Ion-Atom Collisions

Description: Collisions between fast, fully stripped projectiles and atomic targets predominantly result in target electrons being ejected to the continuum. For fast partially stripped projectiles which bring weakly bound electrons into the collision, projectile ionization can also contribute to the observed electron spectra. At lower impact velocities, electron capture by the projectile ion becomes important and higher order processes, often referred to as transfer ionization, can be a significant source o… more
Date: September 1990
Creator: DuBois, R. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Soviet-American gallium experiment at Baksan

Description: A gallium solar neutrino detector is sensitive to the full range of the solar neutrino spectrum, including the low-energy neutrinos from the fundamental proton-proton fusion reaction. If neutrino oscillations in the solar interior are responsible for the suppressed {sup 8}B flux measured by the Homestake {sup 37}Cl experiment and the Kamiokande water Cherenkov detector, then a comparison of the gallium, chlorine, and water results may make possible a determination of the neutrino mass differenc… more
Date: January 1, 1990
Creator: Abazov, A. I.; Abdurashitov, D. N.; Anosov, O. L.; Danshin, S. N.; Eroshkina, L. A.; Faizov, E. L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Atomic data for fusion

Description: This report provides a handbook of recommended cross-section and rate-coefficient data for inelastic collisions between hydrogen, helium and lithium atoms, molecules and ions, and encompasses more than 400 different reactions of primary interest in fusion research. Published experimental and theoretical data have been collected and evaluated, and the recommended data are presented in tabular, graphical and parametrized form. Processes include excitation and spectral line emission, charge exchan… more
Date: July 1, 1990
Creator: Hunter, H. T.; Kirkpatrick, M. I.; Alvarez, I.; Cisneros, C.; Phaneuf, R. A. (eds.) & Barnett, C. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ion clearing the the XLS-ring

Description: The mechanism of ion capture by the beam, their effects on the beam as well as ways to clear the ions are discussed. Special attention is given to these questions for the SXLS ring. 20 refs., 5 figs., 4 tabs.
Date: January 1, 1990
Creator: Bozoki, E.S. & Halama, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Strong field effects and the luminosity lifetime of a heavy-ion collider

Description: The Relativistic Heavy Ion Collider (RHIC) will accelerate fully stripped ions to beam kinetic energies of 250 (Z/A) GeV/u. For the heaviest nuclei, i.e., {sup 179}Au{sup 79+}, 10{sup 9} ions per bunch will circulate in 57 bunches at a kinetic energy of 100 GeV/u. During bunch crossing, the peripheral interactions of the heavy ions generate a sufficiently large electromagnetic field that spontaneous e{sup +}, e{sup {minus}} pair creations will occur. Up to 10{sup 7} pairs per second are expecte… more
Date: January 1, 1990
Creator: Rhoades-Brown, M.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Feasibility studies for an ECR-generated plasma stripper: Preliminary

Description: Computational studies of the principal electron capture and loss processes which take place during interactions between a multi-electron projectile and a target in various degrees of ionization have been initiated. These studies are designed to determine the feasibility of a plasma stripper as a possible alternative to the gaseous and foil strippers which are commonly used to enhance the charge states of energetic ion beams. The idea is based on the knowledge that the stopping powers (energy lo… more
Date: January 1, 1990
Creator: Alton, G. D.; Sparrow, R. A. & Olson, R. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electron ion interactions in crystal channels: Collisions in ultra-dense electron media

Description: Dielectronic excitation of H-like S, Ca and Ti is shown to occur in the dense electron gas of a crystal channel. Cross sections for collisional ionization of the short lived excited states can then be determined. Ionic excitation can also be achieved by resonant coherent excitation in which case specific m states can be excited for further study. 12 refs., 8 figs.
Date: January 1, 1990
Creator: Datz, S.; Dittner, P. F.; Gomez del Campo, J.; Krause, H. F.; Rosseel, T. M. & Vane, C. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electron capture by multicharged ions from hydrogen atoms at eV energies

Description: To quantitatively study electron capture during collisions of multiply charged ions with neutral atoms at near-thermal energies, keV-energy multicharged ion beams are merged with ground-state beams of H or D atoms of chosen velocity such that collisions in the relative energy range 1--1000 eV/amu result. Recent data for O{sup 3+}, O{sup 4+} + H(D) are presented and compared with theoretical predictions. Recently completed modifications to the apparatus are described that will provide a signific… more
Date: January 1, 1990
Creator: Havener, C. C.; Nesnidal, M. P.; Porter, M. R. & Phaneuf, R. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Metastable Enhancement of C{sup +} and O{sup +} Capture Reactions. Final Technical Report, June 1987--September 1990

Description: Single electron capture by 10- to 500-eV singly charged C and O ions traversing targets of H{sub 2} and H was studied with emphasis on comparing cross sections for metastable species with those for the ground state. For an H{sub 2} target cross sections are of the order 10{Angstrom} and 20 to 30 times larger than for ground state species. Electron impact ion sources typically produce 5 to 30% of their output in the metastable state. Previous published work has largely ignored (or failed to dete… more
Date: September 1, 1990
Creator: Thomas, E. W. & Moran, T. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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