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AbstractAbstract

[en] Theoretical 1s, 2s, 2p/sub 1/2/, and 2p/sub 3/2/ energy levels in neutral atoms with 70< or =Z< or =106 are listed. The computations are relativistic and include complete relaxation. The electric energies are based on Dirac--Hartree--Slater wave functions; a first-order correction to the local approximation is made. The Breit-interaction energy and vacuum-polarization energy are listed separately, and a self-energy correction is included. These calculations differ from earlier work by the authors in that a more accurate, frequency-dependent expression for the Breit energy is employed, a Fermi (rather than uniform) distribution of the nuclear charge is assumed, and a screened self-energy correction is applied to the 1s, 2s, 2p/sub 1/2/, 2p/sub 3/2/ levels. Comparison of results with 1967 experimental values adopted by Bearden and new work of Borchert shows better agreement than is provided by earlier calculations with frequency-independent Breit interaction and a uniform nuclear charge distribution

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Atomic Data and Nuclear Data Tables; ISSN 0092-640X; ; v. 26(6); p. 561-566

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AbstractAbstract

[en] Theoretical energy levels and transition probabilities are presented for 41 low-lying levels of phosphous-like ions. The multiconfiguration Dirac-Fock technique is used to calculate energy levels and wave functions. The Breit interaction and Lamb shift contributions are calculated perturbatively as corrections to the Dirac-Fock energy. The M1 and E2 transitions between the five levels of the ground-state configuration and the E1 transitions between excited and ground levels are presented

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Numerical Data

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Atomic Data and Nuclear Data Tables; ISSN 0092-640X; ; v. 30(3); p. 313-315

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AbstractAbstract

[en] The differential polarization coefficients for photonuclear reactions that are tabulated in Atomic Data and Nuclear Data Tables 19, 305 (1977) are correct if each coefficient is multiplied by the factor (-1)/sup()() L+J+S1-L+J+S2/

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Atomic Data and Nuclear Data Tables; ISSN 0092-640X; ; v. 23(2); p. 97-98

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AbstractAbstract

[en] We calculated the e

^{+}, e^{-}-pair conversion coefficient for nuclear transitions with electric multipolarities, E1, E2, and E3 and magnetic multipolarities M1, M2, and M3. Transition energies between 1100 and 8000 keV were considered. The Coulomb distortion of the electron and positron was taken into account by using relativistic continuum wave functions that are solutions of the Dirac equation for the Coulomb potential. We present numerical values for the conversion coefficient for nuclear charge numbers from Z = 0 to Z = 100Primary Subject

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Numerical Data

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Atomic Data and Nuclear Data Tables; ISSN 0092-640X; ; v. 24(6); p. 509-571

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AbstractAbstract

[en] We extend our previous harmonic oscillator analysis to a treatment of general single-particle matrix elements of the multipole operators arising in studies of semileptonic weak and electromagnetic interactions with nuclei. Together with the earlier harmonic oscillator tables the present work will allow the reader to express these general matrix elements compactly in terms of specific radial integrals, which then usually must be evaluated numerically

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Atomic Data and Nuclear Data Tables; ISSN 0092-640X; ; v. 25(1); p. 1-28

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AbstractAbstract

[en] Phase shifts and differential cross sections for spin exchange (charge transfer) and total elastic scattering of protons by hydrogen atoms are presented for 36 and 38 values, respectively, of the collisional kinetic energy in the range 0.0001 to 10 eV (center of mass). The phase shifts are tabulated with a precision of six decimal digits. Each cross section is presented as a graph covering the complete angular range from 0 to π radians (in center-of-mass coordinates). The phase shifts were obtained via partial wave analysis within a modified Perturbed-Stationary-States theory by calculations based upon very accurate (nonrelativistic) internuclear potential energies for the 1 Ssigma/sub g/ and 2Psigma/sub u/ electronic states of H

_{2}^{+}. The cross sections demonstrate a transition from purely quantum behavior at very low energies (<0.1 eV) to semiclassical behavior at higher energies (>1 eV) in which protons scattered by spin exchange are angularly separated from those scattered without exchange. Thus the in-principle unobservable charge-transfer cross section becomes physically measurable at energies greater than about 1 eVPrimary Subject

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Journal Article

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Numerical Data

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Atomic Data and Nuclear Data Tables; ISSN 0092-640X; ; v. 25(4); p. 287-310

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AbstractAbstract

[en] Theoretical transition energies, wavelengths, and oscillator strengths for E1 transitions from the low-lying J = 1/2, J = 3/2, and J = 5/2 excited states to the J = 1/2 and J = 3/2 ground states are presented for ten ions isoelectronic with the chlorine atom. The multiconfiguration Dirac--fock technique is used to generate the wave functions and obtain the energy levels. The effect of some correlation with 3d orbitals is noted. The relativistic forms of the electric-dipole operator are used to obtain values of oscillator strength corresponding to the nonrelativistic length and velocity forms

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Atomic Data and Nuclear Data Tables; ISSN 0092-640X; ; v. 26(5); p. 467-475

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[en] Collision strengths have been calculated for electron impact excitation of many iron ions, using a distorted wave method. The ions studied were Fe X, and Fe XV to Fe XXVI. Tabulations are provided of (1) collision strength vs energy; (2) mixing coefficients needed to define the initial and final states; and (3) fit parameters for the collision strengths, to be applied in the calculation of excitation rate coefficients

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Numerical Data

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Atomic Data and Nuclear Data Tables; ISSN 0092-640X; ; v. 29(3); p. 407-465

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AbstractAbstract

[en] Coulomb-Born-Exchange data for collision strengths for inner-shell excitation from the levels of the 1s

^{2}2s and 1s^{2}2p configurations to all fine-structure levels of the 1s2l2l' configurations in Li-like ions with 8< or =Z< or =74 have been fitted by simple functions of the impact electron energy epsilon in threshold units. To obtain collision rates, these functions can be readily integrated over a Maxwellian energy distribution for the electrons. Fits to the data for transitions between energy terms are also given. In addition, results are given for the transition energies and electric-dipole radiative line strengths. The basic collision-strength data to which the fits have been made are included for a sample of values for Z. These data cover the range of energies 1< or =epsilon< or =15 and include the effects of configuration mixing, parentage mixing, and intermediate couplingPrimary Subject

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Journal Article

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Numerical Data

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Atomic Data and Nuclear Data Tables; ISSN 0092-640X; ; v. 29(3); p. 535-575

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ARGON IONS, CADMIUM IONS, CALCIUM IONS, CHROMIUM IONS, COMPILED DATA, ELECTRON-ION COLLISIONS, EXCITATION, FINE STRUCTURE, GADOLINIUM IONS, IRON IONS, J-J COUPLING, KRYPTON IONS, MAGNESIUM IONS, MOLYBDENUM IONS, NEON IONS, NICKEL IONS, OXYGEN IONS, SILICON IONS, SULFUR IONS, TITANIUM IONS, TUNGSTEN IONS, XENON IONS, ZINC IONS

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AbstractAbstract

[en] Measured cross sections for ejection of electrons from argon gas by protons of 5 keV to 5 MeV energy are given as a function of the angle and energy of ejection. These doubly differential cross sections are integrated to obtain cross sections differential in either angle or energy, total electron production cross sections, and mean energies of ejection

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Atomic Data and Nuclear Data Tables; ISSN 0092-640X; ; v. 23(5); p. 405-442

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