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IEEE Transactions on Nuclear Science

Issue 1  Part 2 • Feb. 1979

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  • [Front cover]

    Publication Year: 1979, Page(s): c1
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  • IEEE Transactions on Nuclear Science

    Publication Year: 1979, Page(s): c2
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  • Proceedings of the Fifth Conference on the Applications of Small Accelerators in Research and Industry

    Publication Year: 1979, Page(s):985 - 988
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  • Contents

    Publication Year: 1979, Page(s):989 - 993
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  • Comments on the Conference

    Publication Year: 1979, Page(s): 994
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  • Conference Committees

    Publication Year: 1979, Page(s):995 - 996
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  • Double K-Shell Vacancy Sharing in Ion-Atom Collisions

    Publication Year: 1979, Page(s):997 - 1000
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    Data are presented for the two-electron one-photon (Kaa) decay mode of double K vacancies distributed between two collision partners. The data were generated from a variety of asymmetric heavy ion-atom systems. We propose a model for KK-vacancy sharing that predicts a double K-vacancy ratio RKK = exp(-4XK) R2K, where RK is the familiar single K-vacancy ratio. This prediction is consiste... View full abstract»

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  • Plasmons, Wakes and Clusters

    Publication Year: 1979, Page(s):1001 - 1005
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1834 KB)

    A charged particle moving with velocity v in a medium having electron collective resonant frequency Ωo sets up electron density fluctuations of two types. Collective fluctuations train the particle composing a conical pattern in a relatively extended periodic wake of wavelength 2πv/Ωo. These fluctuations constitute a mode of energy transport from the p... View full abstract»

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  • X-Ray Polarization in Ion-Atom Collisions

    Publication Year: 1979, Page(s):1006 - 1010
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (857 KB)

    Excited atomic states with spatially anisotropic charge distributions will generally emit polarized anisotropic radiation. The study of K x rays has been a valuable tool in the quest for understanding the ion-atom collision. In addition to cross section and spectroscopic information, which have added much to the total knowledge of the ion-atom collision, K x rays will also yield information about ... View full abstract»

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  • Precision Doubly Differential Cross Section Measurements

    Publication Year: 1979, Page(s):1011 - 1015
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (878 KB)

    Ion Energy Loss Spectrometry has been applied to the measurement of cross sections differential in both scattering angle and ion energy loss. Differential cross sections obtained for excitation of the n=2 level of atomic hydrogen by various ions provides unexpectedly good agreement with the available theories. View full abstract»

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  • K-L and L-K Vacancy Sharing in Ion-Atom Collisions

    Publication Year: 1979, Page(s):1016 - 1019
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (525 KB)

    The molecular model has been very successful in explaining the production of atomic vacancies in low energy ion-atom collisions. One area of active investigation involves the sharing of inner-shell vacancies between two collision partners. The sharing results when a vacancy, which has been produced at some smaller internuclear distance, is transferred from one molecular orbital (MO) to another dur... View full abstract»

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  • Collisional Atomic Physics with Molecular Projectiles

    Publication Year: 1979, Page(s):1020 - 1026
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1083 KB)

    Many collisional atomic physics processes are altered when solid targets are bombarded by molecular, compared to atomic, projectiles. We present energy and angular distribution measurements of exiting particles when 50-300 keV H+2 and HeH+ molecules are incident on thin (1.8-5 μg/cm2) solid carbon targets. We find that the ratio of molecular to atomic projectile energy loss is v... View full abstract»

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  • Charge Transfer in Negative Ion Collisions

    Publication Year: 1979, Page(s):1027 - 1032
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (825 KB)

    Electron detachment is an important inelastic process for negative ion collisions. Because of the large number of electrons produced by electron loss, charge transfer to the target atom or molecule becomes a likely event, whereas in positive ion collisions it is virtually nonexistent. This mechanism is manifested in the formation of temporary negative ions of the target, usually in the form of aut... View full abstract»

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  • Auger Electrons from Molecular Break-Up

    Publication Year: 1979, Page(s):1033 - 1036
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (586 KB)

    In collisions of heavy ions in the MeV energy range with solid or gaseous targets both collision partners are highly excited and highly ionized. Molecules, thus excited, loose most of their outer electrons so that the remaining molecular fragments are strongly repelled by their mutual Coulomb force (dissociation and Coulomb explosion). The influence of the repulsion on the decay of prompt and meta... View full abstract»

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  • Failure of single electron descriptions of molecular orbital collision processes

    Publication Year: 1979, Page(s):1037 - 1041
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (915 KB)

    Inner-shell excitation occurring in low and moderate (keV range) energy collisions between light atomic and ionic systems is frequently describable in terms of molecular promotion mechanisms, which have been extensively explored both theoretically and experimentally. The bulk of such studies have concentrated on processes understandable through the use of single- and independent-electron models. N... View full abstract»

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  • Interference Structure in Ion-Atom Collisions

    Publication Year: 1979, Page(s):1042 - 1046
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1110 KB)

    In low-energy ion-atom collisions, electronic excitation occurs dominantly via non-adiabatic transitions between quantum states of the quasimolecule (collision complex) formed momentarily during the collision. A growing list of cases have been found by several groups in which collision-induced optical emission of particular target or projectile spectral lines oscillates as a function of bombarding... View full abstract»

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  • Applications of Atom-Photon Coincidence Measurements to Charge Transfer

    Publication Year: 1979, Page(s):1047 - 1049
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    Measurements have been made of the polarization of characteristic radiation of excited states, formed in charge exchange collisions, in delayed time coincidence with the neutral particles formed and scattered during the collision. Such information directly provides ratios of populations of orbital magnetic sublevels and phase differences between scattering amplitudes. This relative phase data, in ... View full abstract»

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  • Coherent Excitation of Channeled Ions

    Publication Year: 1979, Page(s):1050 - 1055
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    Channeled ions passing between ordered rows of atoms in a crystal lattice with a velocity v experience a coherent periodic perturbation of frequencies υ = K(v/d), K = 1,2,3,... where d is the distance between atoms in the crystal row. When one of these frequencies coincides with the resonant frequency required to cause transitions in the penetrating ion a resonant coherent excitation (RCE)... View full abstract»

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  • Differential Cross Sections for Electron Emission in Heavy Ion-Atom Collisions

    Publication Year: 1979, Page(s):1056 - 1061
    Cited by:  Papers (7)
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  • Resonant Raman X-Ray Scattering: New Directions

    Publication Year: 1979, Page(s):1062 - 1067
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (867 KB)

    Raman and Resonant Raman x-ray scattering are briefly reviewed. Two recent contributions to the field of resonant Raman x-ray scattering are then described. In the first Resonant Raman x-ray scattering on molybdenum was studied. Beside the usual resonant Raman peak corresponding to the fluorescent KΑ lines another peak with a smaller energy loss was found. It is attributed to resonant Raman... View full abstract»

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  • Effect of Target Thickness on Characteristic Projectile X Rays and REC in Ion-Atom Collisions

    Publication Year: 1979, Page(s):1068 - 1072
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (646 KB)

    A systematic investigation of projectile K x-ray production as a function of target thickness has been conducted for 20-80 MeV Cl ions incident on thin Cu targets. Measured intensities for characteristic x-rays and radiative electron capture (REC) are parametrized according to the model of Betz et al. From the fitting parameters the mean fluorescence yield and the radiative lifetime for K-shell de... View full abstract»

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  • Charge Transfer into Excited States of Hydrogen by Low Energy Protons Incident on Gases

    Publication Year: 1979, Page(s):1073 - 1077
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    Cross section measurements performed at East Texas State University are presented for electron capture into 3s and 4s states of hydrogen for 10-150 keV protons incident on noble gases. The measurement technique and some of its limitations are described. The cross section values obtained are compared to existing measurements and examined in light of certain theoretical predictions. At the higher en... View full abstract»

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  • Electron Capture to Continuum States

    Publication Year: 1979, Page(s):1078 - 1082
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1146 KB)

    The energy spectra for forward ejected electrons in ion-atom collisions exhibit a cusp-shaped feature peaked in energy and angle at ve = vI, where ve and vI are the electron and projectile ion velocities respectively. Studies of 1.6 - 3.8 MeV/A Cq+, Oq+, and Siq+ ions traversing various targets have been carried out using the BNL and ORNL Tandem Van de G... View full abstract»

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  • A New Method for Charge Transfer Calculations for Fast Ion-Atom Collisions

    Publication Year: 1979, Page(s):1083 - 1086
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (494 KB)

    Conventional coupled state approaches to ion-atom collisions are unitary, i. e. (Pψc,Pψc) = 1. However in a target centered basis the true wavefunctionψ, should have the property that (Pψ, Pψ)⩽ 1 for finite times, as ionization channels are open and the electron should have some probability of leaving the target region. I presen... View full abstract»

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  • Atomic Expansion Method for Electron Capture in Ion-Atom Collisions

    Publication Year: 1979, Page(s):1087 - 1092
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IEEE Transactions on Nuclear Science focuses on all aspects of the theory and applications of nuclear science and engineering, including instrumentation for the detection and measurement of ionizing radiation; particle accelerators and their controls; nuclear medicine and its application; effects of radiation on materials, components, and systems; reactor instrumentation and controls; and measurement of radiation in space.

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