Results 271 to 280 of about 1,073,150 (315)

Structure of Atomic Electron Shells

1985
The systematics of electron quantum states in atoms is briefly reviewed along with the systematics of atomic terms and the filling-order of the electronic subshells. The normal electronic configurations and terms of atomic particles are presented, together with the Hartree-Fock and asymptotic parameters of valence electron wavefunctions and radial ...
Alexandre A. Radzig, Boris M. Smirnov
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Atomic force microscopy of virus shells

Seminars in Cell & Developmental Biology, 2018
Microscopes are used to characterize small specimens with the help of probes, such as photons and electrons in optical and electron microscopies, respectively. In atomic force microscopy (AFM) the probe is a nanometric tip located at the end of a microcantilever which palpates the specimen under study as a blind person manages a white cane to explore ...
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Evaluation of atomic shell data

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1996
Abstract Experimental and theoretical values of the following constants have been collected from the literature and evaluated: K-shell fluorescence yield (ωK) and mean L-shell fluorescence yield ( ω L), ratios of X-ray emission probabilities [x = p(Kβ)/p(Kα), and p(Kα2)/p(Kα1)], ratios of emission probabilities of Auger electrons [u = p(KLX)/p ...
E. Schönfeld, H. Janßen
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Coexistence of electronic shells and shells of atoms in microclusters

2008
Microclusters exhibit electronic shells and shells of atoms, which in some cases coexist in one and the same spectrum and in some other cases shells of atoms exist alone. That is, electronic shells alone never exist. Specifically, if the constituents of a cluster are the neutral atoms themselves (i.e., a delocalization of the valence electrons does not
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The filling of shells in compressed atoms

Journal of Physics B: Atomic, Molecular and Optical Physics, 2000
The energy spectra of ground-state, ionized and excited multielectron atoms and ions of the 3d and 4d periods of the periodic table centred in impenetrable spherical confinement are detailed using Hartree-Fock configuration average calculations. It is shown explicitly for the first time that, owing to modifications in 3d and 4d orbital collapse, the ...
J P Connerade, V K Dolmatov, P A Lakshmi
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Shell correction to atomic energy

Soviet Physics Journal, 1984
A method for calculating a shell correction to total atomic energy within the framework of statistical theory is proposed. It is shown that the shell correction which defines the energy component which oscillates with Z is of the relative order of magntiude Z−1. The results obtained agree well with calculations by the Hartree-Fock method.
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Atomic Shell Theory Recast

Physical Review, 1967
Conventional shell theory for the electronic configurations ${l}^{N}$ rests on the separation of the spin and orbital spaces according to the scheme $U(4l+2)\ensuremath{\supset}(2)\ifmmode\times\else\texttimes\fi{}U(2l+1)$. If we are prepared to abandon the total spin quantum number $S$, the more symmetrical reduction $U(4l+2)\ensuremath{\supset}U(2l+1)
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On the determination of atomic shell boundaries

The Journal of Chemical Physics, 1991
Integrations of the charge density between the critical points of ∇2ρ(r) show that these points are not suitable as definitions of atomic shell boundaries. A comparison with the corresponding scheme based on D(r) favors the latter. Minima in D(r) and corresponding shell populations are tabulated for 55≤Z≤92.
Hartmut Schmider, Robin P. Sagar, Vedene H. Smith   +2 more
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Atomic inner-shell transitions

Journal of the Optical Society of America B, 1984
Atomic inner-shell processes have quite different characteristics, in several important aspects, from processes in the optical regime. Energies are large, e.g., the 1s binding energy reaches 100 keV at Z = 87; relativistic and quantum-electrodynamic effects therefore are strong.
Bernd Crasemann, Mau Hsiung Chen, Hans Mark   +2 more
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Alkali-atom shell model

Physics Letters A, 1991
Abstract An alkali-atom shell model for alkali microclusters is introduced, where the quantum constituent is the neutral atom itself considered as a heavy fermion in a central potential created by all atoms in the cluster. Thus, here the magic numbers are due to atoms and not to electrons as in jellium models. The model is applicable under conditions
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