Results 301 to 310 of about 192,299 (340)

Shell-confined hydrogen atom

The Journal of Chemical Physics, 2005
Calculations of electronic energy and static dipole polarizability are reported for the hydrogen atom in the ns states (n=1–6) confined between two impenetrable concentric spheres of inner and outer radii placed at the locations of the radial nodes corresponding to the free hydrogen ns (n=2–7) orbitals.
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Atom confinement in helicoidal cavities

The Journal of Chemical Physics, 1993
The interaction between an atom and a neutral helicoidal cavity is calculated for varying parameters—helix pitch and radius, matter density on the helix, number of helices schematizing the cavity,... . General conditions for the applicability of the continuum approximation, for the occurrence of geometrical confinement leading to atom supermobility in ...
J. Gonzales-Platas, J. Breton, C. Girardet   +2 more
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SPECTRAL PROPERTIES OF CONFINED ATOMS

Surface Review and Letters, 2002
The changes in energy and photoionization spectra of atoms upon confinement by a spherical environment are explored theoretically. Two kinds of confinement are considered: an endohedral confinement, such as inside the bucky-ball C 60, and an impenetrable spherical confinement of adjustable radius.
Dolmatov, V. K., Connerade, J. P., Lakshmi, A. P., Manson, S. T.   +3 more
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Confinement induced binding of noble gas atoms

The Journal of Chemical Physics, 2014
The stability of Ngn@B12N12 and Ngn@B16N16 systems is assessed through a density functional study and ab initio simulation. Although they are found to be thermodynamically unstable with respect to the dissociation of individual Ng atoms and parent cages, ab initio simulation reveals that except Ne2@B12N12 they are kinetically stable to retain their ...
Munmun, Khatua, Sudip, Pan, Pratim K, Chattaraj   +2 more
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Atoms and molecules confined inside C60

Proceedings of the Indian National Science Academy, 2021
Following the discovery of quantum mechanics, properties of atoms and molecules in confined environments were investigated using model systems and the implications of the results for real systems in the laboratory as well as in astrophysical conditions (white dwarfs and neutron stars) were examined.
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Atomic dynamics in confined liquids

Philosophical Magazine B, 1994
Abstract Rather general models are proposed for infinite porous systems with permeable walks, or restrictive connecting channels, at various levels of sophistication from macroscopic, through mixed macroscopic and microscopic, to thoroughly microscopic.
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The Confined Hydrogen Atom Revisited

2014
After an introduction (Sect. 3.1) and a general overview (Sect. 3.2) of various studies on the confined hydrogen atom, we present, in Sect. 3.3, calculations for the ground state energy and other properties of that atomic system as a function of the box radius by using a variational method and a perturbative approach, where both, electron and nucleus ...
N. Aquino, A. Flores-Riveros
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Tightly confining magnetic waveguides for atoms

Technical Digest. Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, 2003
Summary form only given. Recently, there has been much interest in the physics of neutral atoms tightly confined in one or more dimensions. Simultaneously, there has been continued interest in waveguides for atoms. In this work, we present a linear magnetic waveguide for atoms capable of tight transverse confinement, such that transverse energy level ...
J.H. Thywissen, M. Olshanii, G. Zabow, M. Drndic, K.S. Johnson, R.M. Westervelt, M. Prentiss   +6 more
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Laser cooling and confining of atoms

Annual Meeting Optical Society of America, 1985
Using six optical beams (+ and − directions on three orthogonal axes) tuned slightly to the red of resonance it is possible to cool sodium atoms to a few hundred microkelvin. The cooling occurs because the laser radiation pressure creates a damping force which reduces the atomic velocities to a rms value of ~60 cm/s, determined by random scattering. In
L. Hollberg, Steven Chu, John E. Bjorkholm, Alex Cable, A. Ashkin   +4 more
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Interacting atoms under strong quantum confinement

Physical Review A, 2000
We calculate the energy-level shifts of a tightly confined trapped alkali-metal atom in the presence of a second trapped atom. A complete microscopic description of the interaction energy between the two atoms is used. This allows us to study tightly confined atoms near a Feshbach resonance and to evaluate the usefulness of the regularized $\ensuremath{
E. Tiesinga, C. J. Williams, F. H. Mies, P. S. Julienne   +3 more
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