The European Physical Journal D

article

Inelastic cross-sections and natural lifetimes for the and states of Rb

A. Ekers, M. Glodz, J. Szonert, B. Bieniak, more

The European Physical Journal D > 2000 > 8 > 1 > 49-58

Abstract: The results of an experimental study of population dynamics following excitation of [0pt] and [0pt] states of rubidium are reported. Excitation transfer and quenching cross-sections in collisions with ground state rubidium atoms, and natural lifetimes have been measured. The experiment was performed in a vapour cell, using pulsed two-photon excitation and photon counting detection. The...

article

Sub-shell distributions of total electron capture and ionization cross-sections in collisions

M. Das, M. Purkait, C.R. Mandal

The European Physical Journal D > 2000 > 8 > 1 > 13-18

Abstract: The Classical Trajectory Monte-Carlo (CTMC) simulation method has been employed to calculate the total electron capture cross-sections with sub-shell distributions and ionization cross-sections in collision of B q+ (q=1-4) with ground state atomic hydrogen in the energy range of 10-200 keV/amu. The computed results have been observed to be in reasonable agreement with other existing theoretical...

article

3D dissipative motion of atoms in a strongly coupled driven cavity

M. Gangl, H. Ritsch

The European Physical Journal D > 2000 > 8 > 1 > 29-40

Abstract: We develop quantum models for the combined external and internal motion of atoms in a strongly coupled driven cavity mode including the transverse degrees of freedom. Using a simplified Gaussian mode function we determine the parameter regimes and prospects of 3D cooling and confinement of one or two atoms in the cavity field. Analysing the field dynamics for slow atoms traversing the cavity,...

article

Impact broadening and shift rates for the 6p P 7s P transitions of lead induced by collisions with argon and helium

J. Franzke, H.D. Wizemann, K. Niemax, C. Vadla

The European Physical Journal D > 2000 > 8 > 1 > 23-28

Abstract: The collisional broadening and shift rate coefficients of the 283.39 nm (6p2 , 364.06 nm (6p2 , 368.45 nm (6p2 and 405.90 nm (6p2 Pb lines by He and Ar have been measured by fitting the experimental absorption line shapes to theoretical Voigt profiles. The absorption measurements were performed in a resistively heated, Pb loaded oven with an integrated dc noble gas discharge to produce...

article

Relativistic many-body and QED effects on the hyperfine structure of lithium-like ions

S. Boucard, P. Indelicato

The European Physical Journal D > 2000 > 8 > 1 > 59-73

Abstract: The hyperfine splitting of the ground state of three-electron ions is studied in detail with the help of the multi-configuration Dirac-Fock method. We study the role of the magnetic electron-electron interaction and of the negative energy continuum. An all-order evaluation of some vacuum polarization corrections is performed. The Bohr-Weisskopf effect is evaluated in a simple model.

article

Doublet and quartet states of Li

H. Hogreve

The European Physical Journal D > 2000 > 8 > 1 > 85-91

Abstract: Electronic states of the molecular lithium anion are investigated by configuration-interaction calculations. Comparison with the analogously computed potential energy curves for the lowest singlet and triplet states of the neutral Li2 shows that in addition to the well-known stable ground state X there also exist metastable excited states of Li2-. Within the quartet sector, two candidates...

article

Longitudinal oscillations in a classical Yang-Mills plasma

F. Zonca, R. Sisto

The European Physical Journal D > 2000 > 8 > 1 > 131-143

Abstract: An analytical approach to the non linear system describing classical 1D longitudinal oscillations in an SU(2) plasma is proposed. A physical interpretation is given for two distinct Abelian and non-Abelian phases of the non-linear oscillations. Numerical estimates of meaningful physical quantities are made. Analytical results are extended to the physically more relevant SU(3) case, for which...

article

Time-evolution of cascade processes of muonic atoms in hydrogen-helium mixtures

V. Bystritsky, W. Czapliski, M. Filipowicz, E. Gua, more

The European Physical Journal D > 2000 > 8 > 1 > 75-83

Abstract: The time-dependence of the population of muonic hydrogen states in hydrogen-helium mixtures is calculated for principal quantum number n. The number of muons transferred to helium nuclei is also determined. The dependence of the population of the ground state of muonic hydrogen on time and target density and the helium concentration is also considered. The results are in agreement with...

article

Temperature-dependent ionization potential of sodium clusters

J. Akola, A. Rytknen, H. Hkkinen, M. Manninen

The European Physical Journal D > 2000 > 8 > 1 > 93-99

Abstract: The ionization potential of sodium clusters ( ) at a finite temperature is studied using density functional theory and ab initio molecular dynamics. The threshold regions of the photoionization efficiency curves are deduced from the integrated IP distributions, which are obtained from the energy eigenvalues of the highest occupied Kohn-Sham states during molecular dynamics by applying a...

article

The open path phase for degenerate and non-degenerate systems and its relation to the wave-function modulus

R. Englman, A. Yahalom, M. Baer

The European Physical Journal D > 2000 > 8 > 1 > 1-7

Abstract: We calculate the open path phase in a two state model with a slowly (nearly adiabatically) varying time-periodic Hamiltonian and trace its continuous development during a period. We show that the topological (Berry) phase attains or depending on whether there is or is not a degeneracy in the part of the parameter space enclosed by the trajectory. Oscillations are found in the phase....

article

Relevance of temporal coherence in the second-harmonic cross-correlation measurement of a multiply scattered laser pulse

A. Andreoni, M. Bondani, M.A.C. Potenza, F. Villani

The European Physical Journal D > 2000 > 8 > 1 > 111-116

Abstract: Second-harmonic cross-correlation operates a selection in time-phase among the randomly de-phased contributions to an optical field that propagated through a scattering medium. It can thus be used to selectively detect the weak contribution remaining coherent with the incident field.

article

A theory of electromagnetism with uniquely defined potential and covariant conserved spin

A.B. van Oosten

The European Physical Journal D > 2000 > 8 > 1 > 9-12

Abstract: The Lagrangian is shown to yield a non-gauge-invariant theory of electromagnetism. The potential is uniquely determined by the inhomogeneous wave equation and boundary conditions at infinity. The Lorenz condition and minimal coupling follow from charge conservation. Electromagnetic spin is conserved and a spin operator is proposed without sacrificing covariance. Covariant quantisation is...

article

Lithium vapour excitation at 2S 3D two-photon resonance

I. Labazan, S. Miloevi

The European Physical Journal D > 2000 > 8 > 1 > 41-47

Abstract: We report study of processes which occur in lithium vapour under two-photon excitation of the Li(3D) state at 639.1 nm. A time-resolved technique has been used to measure the fluorescence from the Li(3D), Li(2P) and Li(3P) states. We have determined radiation rates for lithium atom densities in the range 1013-1014 cm-3 and laser powers (105-106 Wcm-2). The ground-state lithium atom density...

article

One-component-plasma: Going beyond Debye-Hckel

A.G. Moreira, R.R. Netz

The European Physical Journal D > 2000 > 8 > 1 > 145-149

Abstract: Using field-theoretic methods, we calculate the internal energy for the One-Component Plasma (OCP). We go beyond the recent calculation by Brilliantov [N. Brilliantov, Contrib. Plasma Phys. 38, 489 (1998)] by including non-Gaussian terms. We show that, for the whole range of the plasma parameter , the effect of the higher-order terms is small and that the final result is not improved relative...

article

Erratum: Eur. Phys. J. D 5 207216 (1999)

The European Physical Journal D > 2000 > 8 > 1 > 151

article

Spatial and temporal properties of parametric fluorescence around degeneracy in a type I LBO crystal

F. Devaux, E. Lantz

The European Physical Journal D > 2000 > 8 > 1 > 117-124

Abstract: We present a theoretical and experimental study of the spatio-temporal properties of the spontaneous parametric emission generated in a type I LBO crystal around degeneracy. The number of quasi-phase-matched modes is shown to be equal to the number of spatio-temporal degrees of freedom of the image that can be parametrically amplified. From this number, we demonstrate the possibility of...

article

Quantum theory of fluctuations in a cold damped accelerometer

F. Grassia, J.-M. Courty, S. Reynaud, P. Touboul

The European Physical Journal D > 2000 > 8 > 1 > 101-110

Abstract: We present a quantum network approach to real high sensitivity measurements. Thermal and quantum fluctuations due to active as well as passive elements are taken into account. The method is applied to the analysis of the capacitive accelerometer using the cold damping technique, developed for fundamental physics in space by ONERA and the ultimate limits of this instrument are discussed....

article

Metastability range of the Bose condensate in Li-fermion mixtures at T = 0

M. Amoruso, C. Minniti, M.P. Tosi

The European Physical Journal D > 2000 > 8 > 1 > 19-21

Abstract: We evaluate the ground state of a mixture of bosons and spin-polarized fermions in the case of attractive boson-boson interactions, using a variational Ansatz for the Bose condensate wave function and the Thomas-Fermi approximation for the fermions in the mean field of the condensate. Within this approximation we show that the presence of the fermions tends to restrict the metastability...

article

Current-voltage characteristics of a non-transferred plasma spray torch

R. Ramasamy, V. Selvarajan

The European Physical Journal D > 2000 > 8 > 1 > 125-129

Abstract: I-V characteristics of a non-transferred DC plasma spray torch operating on argon and argon + nitrogen mixtures are reported. Arc voltage is decreased with increase in arc current and increased with increase in electrode gap. Arc power is higher at higher percentage of nitrogen in argon. Nottingham co-efficients were calculated using numerical method.

article

3D dissipative motion of atoms in a strongly coupled driven cavity

M. Gangl, H. Ritsch

The European Physical Journal D - Atomic, Molecular, Optical and Plasma... > 2000 > 8 > 1 > 29-40

We develop quantum models for the combined external and internal motion of atoms in a strongly coupled driven cavity mode including the transverse degrees of freedom. Using a simplified Gaussian mode function we determine the parameter regimes and prospects of 3D cooling and confinement of one or two atoms in the cavity field. Analysing the field dynamics for slow atoms traversing the cavity, we show...

INFONA - science communication portal

The European Physical Journal D

Inelastic cross-sections and natural lifetimes for the and states of Rb

Sub-shell distributions of total electron capture and ionization cross-sections in collisions

3D dissipative motion of atoms in a strongly coupled driven cavity

Impact broadening and shift rates for the 6p P 7s P transitions of lead induced by collisions with argon and helium

Relativistic many-body and QED effects on the hyperfine structure of lithium-like ions

Doublet and quartet states of Li

Longitudinal oscillations in a classical Yang-Mills plasma

Time-evolution of cascade processes of muonic atoms in hydrogen-helium mixtures

Temperature-dependent ionization potential of sodium clusters

The open path phase for degenerate and non-degenerate systems and its relation to the wave-function modulus

Relevance of temporal coherence in the second-harmonic cross-correlation measurement of a multiply scattered laser pulse

A theory of electromagnetism with uniquely defined potential and covariant conserved spin

Lithium vapour excitation at 2S 3D two-photon resonance

One-component-plasma: Going beyond Debye-Hckel

Erratum: Eur. Phys. J. D 5 207216 (1999)

Spatial and temporal properties of parametric fluorescence around degeneracy in a type I LBO crystal

Quantum theory of fluctuations in a cold damped accelerometer

Metastability range of the Bose condensate in Li-fermion mixtures at T = 0

Current-voltage characteristics of a non-transferred plasma spray torch

3D dissipative motion of atoms in a strongly coupled driven cavity

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