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Atomic Physics papers — page 3

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ATI as a source for multiply charged ion production in a laser field
A theory for the many-electron multi-photon process is presented. It is shown that after single-electron excitation into some level in the continuum (ATI) an inelastic collision of the excited…
M. Yu. KuchievJan 17, 1996
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Adiabatic mechanism of the multiply charged ion production by a laser field through ATI states of an atom
ATI can be followed by an inelastic collision of the ionized electron with the parent atomic particle resulting in an excitation of the ion. It may be a continuum state excitation producing the…
M. Yu. KuchievJan 17, 1996
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Motion Tomography of a single trapped ion
A method for the experimental reconstruction of the quantum state of motion for a single trapped ion is proposed. It is based on the measurement of the ground state population of the trap after a…
J. F. Poyatos, R. Walser, J. I. Cirac et al.Jan 8, 1996
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Conditional Hamiltonian and Reset Operator in the Quantum Jump Approach
For the time development of a single system in the quantum jump approach or for quantum trajectories one requires the conditional (reduced) Hamiltonian between jumps and the reset operator after a…
Gerhard C. Hegerfeldt, Dirk G. SondermannDec 11, 1995
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Coulomb Energy Averaged over the nN-Atomic States with a Definite Spin
A purely group-theoretical approach (for which the symmetric group plays a central rôle), based upon the use of properties of fractional-parentage coefficients and isoscalar factors, is developed for…
M. Kibler, Yu. F. SmirnovDec 4, 1995
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The Periodic Table in Flatland
The D-dimensional Coulomb system serves as a starting point for generating generalized atomic shells. These shells are ordered according to a generalized Madelung rule in D dimensions. This rule…
T. Negadi, M. KiblerDec 2, 1995
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Two-Photon Spectroscopy Between States of Opposite Parities
Magnetic- and electric-dipole two-photon absorption (MED-TPA), recently introduced as a new spectroscopic technique for studying transitions between states of opposite parities, is investigated from…
M. Daoud, M. KiblerNov 29, 1995
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On the Use of Quantum Algebras in Rotation-Vibration Spectroscopy
A two-parameter deformation of the Lie algebra u2 is used, in conjunction with the rotor system and the oscillator system, to generate a model for rotation-vibration spectroscopy of molecules and…
R. Barbier, M. KiblerNov 13, 1995
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Introduction to light forces, atom cooling, and atom trapping
This paper introduces and reviews light forces, atom cooling and atom trapping. The emphasis is on the physics of the basic processes. In discussing conservative forces the semi-classical dressed…
Craig SavageOct 18, 1995
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Band Gaps for Atoms in Light based Waveguides
The energy spectrum for a system of atoms in a periodic potential can exhibit a gap in the band structure. We describe a system in which a laser is used to produce a mechanical potential for the…
J. J. Hope, C. M. SavageOct 10, 1995
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Quantum uncertainties in coupled harmonic oscillator
In this paper we analyze the quantum uncertainties and the photon statistics in the interaction between the two modes of radiation by treating them as coupled harmonic oscillator with the motivation…
Abir Bandyopadhyay, Jagdish RaiOct 5, 1995
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Quantum state diffusion with a moving basis: computing quantum-optical spectra
Quantum state diffusion (QSD) as a tool to solve quantum-optical master equations by stochastic simulation can be made several orders of magnitude more efficient if states in Hilbert space are…
R. Schack, T. A. Brun, I. C. PercivalOct 3, 1995
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Electron impact excitation cross sections for allowed transitions in atoms
We present a semiempirical Gaunt factor for widely used Van Regemorter formula [Astrophys. J. 136, 906 (1962)] for the case of allowed transitions in atoms with the LS coupling scheme. Cross sections…
V. Fisher, V. Bernshtam, H. Golten et al.Sep 28, 1995
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Squeezing in the interaction of radiation with two-level atoms
We propose a simple experimental procedure to produce squeezing and other non-classical properties like photon antibunching of radiation, and amplification without population inversion. The method…
Abir Bandyopadhyay, Jagdish RaiSep 25, 1995
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Hyperspherical Close-Coupling Calculation of D-wave Positronium Formation and Excitation Cross Sections in Positron-Hydrogen Scattering
Hyperspherical close-coupling method is used to calculate the elastic, positronium formation and excitation cross sections for positron collisions with atomic hydrogen at energies below the H(n=4)…
Yan Zhou, C. D. LinSep 22, 1995
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Nuclear spin--rotation interaction in the hydrogen molecular ion
The nuclear spin--rotation interaction in the hyperfine structure of the hydrogen molecular ion is investigated. The interaction constants are determined and are found to differ in sign and magnitude…
James F. BabbSep 20, 1995
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Conventional Quantum Chemical Correlation Energy versus Density-Functional Correlation Energy
We analyze the difference between the correlation energy as defined within the conventional quantum chemistry framework and its namesake in density-functional theory. Both quantities are rigorously…
E. K. U. Gross, M. Petersilka, T. GraboSep 19, 1995
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2-2 and 2-3 Intercombination Transitions in Be-like Ions
We report here on calculation of probabilities of intercombination transitions 2s2 1S0 - 2s2p 3P1, 2s3p 3P1 for Be-like ions along the isoelectronic sequence for large range of…
Yu. V. Ralchenko, L. A. VainshteinSep 16, 1995
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