ORNL Physics Division

Atomic Physics

Overview

Accelerator-Based Atomic Physics

Low Energy Atomic Physics

Accelerator-Based Atomic Physics

Interactions of Ultrarelativistic 33-TeV Pb Ions with Matter-Electron Capture and Ionization and Restricted Energy Loss
H. F. Krause, S. Datz, and C. R. Vane
ultrarelativistic, electron capture, ionization, restricted energy loss

Dissociative Recombination of Molecular Ions
S. Datz
dissociative recombination

Sub-Surface Neutralization of Highly-Charged, Slow Recoil Ions
C. R. Vane and N. L. Jones
neutralization, slow recoil ions

Charge-State Dependence of Energy Loss in Random Solids
B. Rosner, S. Datz, W. Wu, N. L. Jones, D. R. Schultz, and C. O. Reinhold
energy loss, solids

Abstracts of Papers Published or Submitted for Publication

Dissociative Recombination and Excitation of CH₅⁺: Absolute Cross Sections and Branching Fractions
J. Semaniak, Å. Larson, A. Le Padellec, C. Strömholm, M. Larsson, S. Rosén, R. Peverall, H. Danared, N. Djuric, G. H. Dunn, and S. Datz
dissociative recombination, cross sections, branching fractions

Charge-State Dependence of Energy Loss in Random Solids
B. Rosner, S. Datz, W. Wu, N. L. Jones, D. R. Schultz, and C. O. Reinhold
energy loss, solids

Electron Capture and Ionization of Pb Ions at 33 TeV
H. F. Krause, C. R. Vane, S. Datz, P. Grafström, H. Knudsen, C. Scheidenberger, and R. H. Schuch
electron capture, ionization, Pb

Measurements of Positrons from Pair Production in Coulomb Collisions of 33-TeV Lead Ions with Fixed Targets
C. R. Vane, S. Datz, E. F. Deveney, P. F. Dittner, H. F. Krause, R. Schuch, H. Gao, and R. Hutton
positrons, pair production, Pb

Atomic Collisions with 33-TeV Lead Ions
C. R. Vane, S. Datz, H. F. Krause, P. F. Dittner, E. F. Deveney, H. Knudsen, P. Grafström, R. Schuch, H. Gao, and R. Hutton
atomic collisions, Pb

Dissociative Recombination of H₂⁺: Product State Information and Very Large Cross Sections of Vibrationally Excited H₂⁺
W. J. van der Zande, J. Semaniak, V. Zengin, G. Sundström, S. Rosén, C. Strömholm, S. Datz, H. Danared, and M. Larsson
dissociative recombination, H₂⁺, cross sections

Atomic Collisions at Ultrarelativistic Energies: 6.4-TeV S and 33.2-TeV Pb
S. Datz, H. F. Krause, C. R. Vane, P. F. Dittner, E. F. Deveney, H. Knudsen, P. Grafström, R. Schuch, H. Gao, and R. Hutton
atomic collisions, ultrarelativistic

Dissociative Recombination and Dissociative Excitation of ⁴HeH⁺: Absolute Cross Sections and Mechanisms
C. Strömholm, J. Semaniak, S. Rosén, H. Danared, S. Datz, W. van der Zande, and M. Larsson
dissociative recombination, excitation, ⁴HeH⁺, cross sections

Production and Collisions of Neutral Beams in the 100 keV to 6 MeV Range
J. M. Sanders, S. L. Varghese, S. Datz, E. Deveney, H. F. Krause, J. L. Shinpaugh, C. R. Vane, and R. D. DuBois
neutral beams

Product-state Distributions in the Dissociative Recombination of ³HeD⁺ and ⁴HeH⁺
J. Semaniak, S. Rosén, G. Sundström, C. Strömholm, S. Datz, H. Danared, M. af Ugglas, M. Larsson, W. J. van der Zande, Z. Amitay, U. Hechtfischer, M. Grieser, R. Repnow, M. Schmidt, D. Schwalm, R. Wester, A. Wolf, and D. Zaifman
dissociative recombination, ³HeD⁺, ⁴HeH⁺

Novel Apparatus and Methods for Performing Remotely Controlled Experiments at CERN
H. F. Krause, E. F. Deveney, N. Jones, C. R. Vane, S. Datz, H. Knudsen, P. Grafström, and R. Schuch

Branching Fractions in Dissociative Recombination of CH₂⁺
Å. Larson, A. Le Padellec, J. Semaniak, C. Strömholm, M. Larsson, S. Rosén, R. Peverall, H. Danared, N. Djuric, G. H. Dunn, and S. Datz
fractions, dissociative recombination, CH₂⁺

Formation of HeH⁺ from Positron Interaction with H₂ and He Mixtures
J. Xu, L. D. Hulett, J. Moxom, W. Wu, S. Datz, and P. M. Schrader
positrons

Anomalies in the Nuclear Dissociation Cross Sections of ²⁰⁸Pb at 33 TeV
S. Datz, J. R. Beene, P. Grafström, H. Knudsen, H. F. Krause, R. H. Schuch, and C. R. Vane
nuclear dissociation, cross sections, Pb

Fluorescence and Coster-Kronig Yields of the L₁ Shell in Gadolinium
T. Papp, J. L. Campbell, and S. Raman
fluorescence, Coster-Kronig yields, Gd

Low Energy Atomic Physics

Ion-Atom Collisions Using Merged Beams
C. C. Havener

Crossed Beams Measurements of Electron-Impact Ionization of Multiply-Charged Ions
M. E. Bannister, N. Djuric, G. H. Dunn, A.C.H. Smith, B. Wallbank, and O. Woitke

Merged-Beams Measurements of Electron-Impact Excitation of Multiply-Charged Ions
M. E. Bannister, Y.-S. Chung, N. Djuric, G. H. Dunn, A.C.H. Smith, B. Wallbank, O. Woitke, and S. Zhou

Ion-Surface Scattering Experiments at ORNL MIRF Using Decelerated Beams
F. W. Meyer and V. A. Morozov

Theoretical Atomic Physics for Fusion: Low Energy Elastic and Inelastic Atomic and Molecular Collisions
P. S. Krstic and D. R. Schultz

The Controlled Fusion Atomic Data Center
M. E. Bannister, H. B. Gilbody, C. C. Havener, P. S. Krstic, F. W. Meyer, T. J. Morgan, F. M. Ownby, R. A. Phaneuf, M. S. Pindzola, D. R. Schultz, P. C. Stancil, and E. W. Thomas

Theoretical Atomic and Molecular Astrophysics
D. J. Jeffery, J. B. Kingdon, P. S. Krstic, W. Liu, D. R. Schultz, and P. C. Stancil

Diagnostics of High Temperature Plasmas: Alpha Particle Diagnostic Development
R. K. Richards, D. P. Hutchinson, C. A. Bennett, and C. H. Ma

Abstracts of Papers Published or Submitted for Publication

Multicharged Ion-Surface Interaction Studies at ORNL with Decelerated Beams
F. W. Meyer and V. A. Morozov

Multi-Coincidence Studies as a Technique for the Investigation of Ion-Surface Interaction
V A. Morozov, F. W. Meyer, and P. Roncin

Grazing-Ion-Surface Interaction as a Probe of Surface States
Q. Yan, J. Burgdörfer, and F. W. Meyer

The Evolving Role of Atomic Collisions in Magnetic Fusion Research
F. W. Meyer

ECR-Based Atomic Collision Physics Research at ORNL
F. W. Meyer, M. E. Bannister, J. W. Hale, C. C. Havener, O. Woitke, and Q. Yan

Enhancing the Performances of Traditional Electron Cyclotron Resonance Ion Sources with Multiple-Discrete-Frequency Microwave Radiation
G. D. Alton, F. W. Meyer, Y. Liu, J. R. Beene, and D. Tucker

On the Neutralization of Singly and Multicharged Projectiles During Grazing Interactions with LiF(100)
F. W. Meyer, Q. Yan, P. Zeijlmans van Emmichoven, I. G. Hughes, and G. Spierings

Projectile Neutralization During Grazing Interactions of Multicharged Ions with LiF(100)
Q. Yan and F. W. Meyer

Absolute Cross Sections for Near-Threshold Electron-Impact Excitation of the 3s^{2 1}S --> 3s3p ¹P and 3s^{2 1}S --> 3s3p ³P Transitions in Si²⁺
B. Wallbank, N. Djuric, O. Woitke, S. Zhou, G. H. Dunn, A.C.H. Smith, and M. E. Bannister

Resonance Interference and Absolute Cross Sections in Near-Threshold Electron-Impact Excitation of Multicharged Ions
M. E. Bannister, Y.-S. Chung, N. Djuric, B. Wallbank, O. Woitke, S. Zhou, G. H. Dunn, and A.C.H. Smith

Absolute Cross Sections for Near-Threshold Electron-Impact Excitation of the 2S ²S --> 2P ²P Transition in C³⁺
M. E. Bannister, Y.-S. Chung, N. Djuric, B. Wallbank, O. Woitke, S. Zhou, G. H. Dunn, and A.C.H. Smith

Recent Experiments on Near-Threshold Electron-Impact Excitation of Multiply Charged Ions
M. E. Bannister, N. Djuric, O. Woitke, G. H. Dunn, Y.-S. Chung, A.C.H. Smith, and B. Wallbank

Absolute Cross Sections for Excitation of the 2s ²S --> 2p ²P Transition in B²⁺ and for Electron-Impact Single Ionization of B²⁺
O. Woitke, N. Djuric, G. H. Dunn, M. E. Bannister, A.C.H. Smith, B. Wallbank, N. R. Badnell, and M. S. Pindzola

State and Angular Resolved Electron Capture in a Merged-Beams Apparatus
W. Wu and C. C. Havener

Low-Energy Electron Capture by C⁴⁺ Ions from Atomic Hydrogen
F. W. Bliek, R. Hoekstra, M. E. Bannister, and C. C. Havener

State-Selective Electron Capture by Si⁴⁺ from D in a Merged-Beams Apparatus
W. Wu and C. C. Havener

Low-Energy Electron Capture by B⁴⁺ Ions from Hydrogen Atoms
M. Pieksma and C. C. Havener

Ion-Atom Collisions
C. C. Havener

Elastic Scattering and Charge Transfer in Slow Collisions: Isotopes of H and H⁺ Colliding with Isotopes of H and with He
P. S. Krstic and D. R. Schultz

Elastic and Vibrationally Inelastic Slow Collisions: H + H₂, H⁺ + H₂
P. S. Krstic and D. R. Schultz

Relations Between Elastic Cross Sections for Collisions Among Isotopes of Hydrogen Ions, Atoms and Molecules
P. S. Krstic and D. R. Schultz

Elastic and Related Transport Cross Sections for Collisions Among Isotopomers of H⁺ + H, H⁺ + H₂, H⁺ + He, H + H, and H + H₂
P. S. Krstic and D. R. Schultz

Atomic and Molecular Physics and Data Activities for Astrophysics at Oak Ridge National Laboratory
D. J. Jeffery, P. S. Krstic, W. Liu, D. R. Schultz, and P. C. Stancil

Heavy Particle Atomic Collisions in Astrophysics: Beyond H and He Targets
P. C. Stancil, P. S. Krstic, and D. R. Schultz

Electron-Impact Ionization of Atomic Ions in the Na Isoelectronic Sequence
M. S. Pindzola, D. M. Mitnik, J. A. Shaw, D. C. Griffin, N. R. Badnell, H. P. Summers, and D. R. Schultz

Theoretical Treatment of Charge Transfer Processes of Relevance to Astrophysics
P. S. Krstic, P. C. Stancil, and D. R. Schultz

Argon Density Measurements from Charge-Exchange Spectroscopy
D. G. Whyte, R. C. Isler, M. R. Wade, D. R. Schultz, P. S. Krstic, C. C. Hung, and W. P. West

Electron Capture in Collisions of C⁺ with H and H⁺ with C
P. C. Stancil, J.-P. Gu, C. C. Havener, P. S. Krstic, D. R. Schultz, M. Kimura, B. Zygelman, G. Hirsch, R. J. Buenker, and M. E. Bannister

Charge Transfer in Collisions of C⁺ with H and H⁺ with C
P. C. Stancil, C. C. Havener, P. S. Krstic, D. R. Schultz, M. Kimura, J.-P. Gu, G. Hirsch, R. J. Buenker, and B. Zygelman

The ORNL Controlled Fusion Atomic Data Center
D. R. Schultz, P. S. Krstic, F. M. Ownby, F. W. Meyer, C. C. Havener, M. E. Bannister, W. Liu, D. J. Jeffery, and P. C. Stancil

Panel on Increasing the Visibility and Publicity for Data Activities and Assuring the Open Exchange of Data
D. R. Schultz

Atomic Collision Databases and Data Services -- a Survey
D. R. Schultz

Ionization of Type Ia Supernovae: Electron Impact, Photon Impact, or Charge Transfer?
W. Liu, D. J. Jeffery, and D. R. Schultz

The Multielectron, Hidden Crossings Method for Inelastic Processes in Slow Ion/Atom-Atom Collisions
G. Bent, P. S. Krstic, and D. R. Schultz

Ionization of He by Slow Protons
P. S. Krstic, D. R. Schultz, and G. Bent

Emission from Cobalt in Type Ia Supernovae
W. Liu, D. J. Jeffery, D. R. Schultz, P. Quinet, J. Shaw, and M. S. Pindzola

Nebular Spectra of the Unusual Type Ia Supernova 1991T
W. Liu, D. J. Jeffery, and D. R. Schultz

Nebular Spectra of Type Ia Supernova
W. Liu, D. J. Jeffery, and D. R. Schultz

On the Unexpected Oscillation of the Total Cross Section for Excitation in He²⁺ + H Collisions
D. R. Schultz, C. O. Reinhold, and P. S. Krstic

Elastic, Excitation, Ionization and Charge Transfer Cross Sections of Current Interest in Fusion Energy Research
D. R. Schultz and P. S. Krstic

Collision Processes
D. R. Schultz

New Method for Treating Slow Multielectron, Multicenter Atomic Collisions
P. S. Krstic, G. Bent, and D. R. Schultz

On-Line Atomic Data Access
D. R. Schultz and J. K. Nash

Elastic Processes in 1-1000 keV/u Collisions of Be^q+ (q=2-4) Ions with Atomic and Molecular Hydrogen
D. R. Schultz, P. S. Krstic, and C. O. Reinhold

Elastic Processes in Slow Collisions of Be and Be Ions with Hydrogen
P. S. Krstic, D. R. Schultz, and G. Bent

Inelastic Processes in Slow Collisions of Antiprotons with Hydrogenic Ions
P. S. Krstic, D. R. Schultz, and R. K. Janev

Molecular Processes in the Early Universe
A. Dalgarno, P. C. Stancil, and S. Lepp
early universe

Molecules and Dust in Supernovae
A. Dalgarno, P. C. Stancil, and S. Lepp
supernova

AB Initio Study of Charge Transfer in Low Energy Si²⁺ Collisions with Atomic Hydrogen
N. J. Clarke, P. C. Stancil, B. Zygelman, and D. L. Cooper
charge transfer, atomic collisions

Molecules in Supernova 1987A
S. Lepp, P. C. Stancil, and A. Dalgarno
supernova

Molecule Formation and Destruction Processes in Astrophysical Environments
P. C. Stancil

Chemical Processes in Astrophysical Radiation Fields
P. C. Stancil and A. Dalgarno
radiative attachment, atomic processes

The Radiative Association of H and D
P. C. Stancil and A. Dalgarno
radiative association

The Deuterium Chemistry of the Early Universe
P. C. Stancil, S. Lepp, and A. Dalgarno
early universe

Calculations of Electron Capture in Low Energy Ion-Molecule Collisions
P. C. Stancil, B. Zygelman, and K. Kirby
charge transfer, atomic collisions

Stimulated Radiative Association of He and He⁺
B. Zygelman, P. C. Stancil, and A. Dalgarno
radiative association