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  • 1
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    Threshold law for positron-atom impact ionisation (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The threshold law for ionisation of atoms by positron impact is adduced in analogy with our approach to the electron-atom ionization. It is concluded the Coulomb-dipole region of the potential gives the essential part of the interaction in both cases and leads to the same kind of result: a modulated linear law. An additional process which enters positron ionization is positronium formation in the continuum, but that will not dominate the threshold yield. The result is in sharp contrast to the positron threshold law as recently derived by Klar on the basis of a Wannier-type analysis.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: Journal of Physics B - Atomic and Molecular Physics; 15; Apr. 28
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  • 2
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    Hybrid theory calculation of electron-N2 scattering at 5 and 10 eV (1976)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Hybrid theory results pertaining to e-N2 scattering have been evaluated for differential elastic and first vibrational excitation cross sections at 5 and 10 eV. Comparison with the recent experiment of Chutjian, Srivastava, and Trajmar is good (1976), although there is an indication that the calculated nonresonant (adiabatic-nuclei) contribution is somewhat too small. A short discussion engendered by this point is given.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: Journal of Chemical Physics; 65; Dec. 1
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  • 3
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    A distorted-wave methodology for electron-ion impact excitation - Calculation for two-electron ions (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: A distorted-wave program is being developed for calculating the excitation of few-electron ions by electron impact. It uses the exchange approximation to represent the exact initial-state wavefunction in the T-matrix expression for the excitation amplitude. The program has been implemented for excitation of the 2/1,3/(S,P) states of two-electron ions. Some of the astrophysical applications of these cross sections as well as the motivation and requirements of the calculational methodology are discussed.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: Journal of Physics B - Atomic and Molecular Physics; 10; Oct. 1
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  • 4
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    Internuclear dependence of the polarizability of N2 (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: A study is made of the internuclear dependence of the polarizability of N2. Specifically, the dependencies of parallel and perpendicular polarizabilities on internuclear separation is found for the N2 molecule in its ground state. Results are presented for vibrationally elastic cross sections as functions of incident electron energy in an eight-state calculation and for the excitation of the first vibrational state.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
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  • 5
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    Calculation of the polarization potential for e-N2 collisions (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: A polarization potential V(pol) for e-N2 collisions is calculated by the generalization of the static part of the method of polarized orbitals to molecular targets. Partial differential equations (PDE) are derived for polarized orbitals, which are functions of the distance (r) from the molecular center and angle (theta) from the molecular axis. The equations are solved with the use of the noniterative PDE technique. From the polarized orbitals a polarization potential can be constructed whose r and theta dependence is found to be significantly different from the well-known phenomenological one. The two potentials are further compared by carrying out limited hybrid-theory scattering calculations. Only those scattering results based on the calculated V(pol) are in satisfactory accord with experiment.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: Physical Review A - General Physics, 3rd Series (ISSN 0556-2791); 28; Aug. 198
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