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  • Articles  (807)
  • Springer  (807)
  • American Chemical Society (ACS)
  • American Geophysical Union
  • Elsevier
  • National Academy of Sciences
  • 2015-2019  (480)
  • 2005-2009  (327)
  • 1990-1994
  • 1980-1984
  • 2017  (480)
  • 2005  (327)
  • 1983
  • European Physical Journal D  (138)
  • 1700
  • Physics  (807)
  • Geography
  • Process Engineering, Biotechnology, Nutrition Technology
Collection
  • Articles  (807)
Source
Publisher
  • Springer  (807)
  • American Chemical Society (ACS)
  • American Geophysical Union
  • Elsevier
  • National Academy of Sciences
Years
  • 2015-2019  (480)
  • 2005-2009  (327)
  • 1990-1994
  • 1980-1984
Year
Journal
Topic
  • Physics  (807)
  • Geography
  • Process Engineering, Biotechnology, Nutrition Technology
  • 1
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    Correlation, Breit and Quantum Electrodynamics effects on energy level and transition properties of W 54+ ion (2017)
    Springer
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    Publication Date: 2017-03-22
    Description: The electron correlation effects and Breit interaction as well as Quantum Electro-Dynamics (QED) effects were expected to have important contribution to the energy level and transition properties of heavy highly charged ions. The ground states [Ne]3 s 2 3 p 6 3 d 2 and first excited states [Ne]3 s 2 3 p 5 3 d 3 of W 54+ ion have been studied by using Multi-Configuration Dirac-Fock method with the implementation of Grasp2K package. A restricted active space method was employed to investigate the correlation contribution from different models. The Breit interaction and QED effects were taken into account in the relativistic configuration interaction calculation with the converged wavefunction. It is found that the correlation contribution from 3 s and 3 p orbital have important contribution to the energy level, transition wavelength and probability of the ground and the first excited state of W 54+ ion. Graphical abstract
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  • 2
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    Coupling intensity between discharge and magnetic circuit in Hall thrusters (2017)
    Springer
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    Publication Date: 2017-03-22
    Description: Coupling oscillation is a newly discovered plasma oscillation mode that utilizes the coupling between the discharge circuit and magnetic circuit, whose oscillation frequency spectrum ranges from several kilohertz to megahertz. The coupling coefficient parameter represents the intensity of coupling between the discharge and magnetic circuits. According to previous studies, the coupling coefficient is related to the material and the cross-sectional area of the magnetic coils, and the magnetic circuit of the Hall thruster. However, in our recent study on coupling oscillations, it was found that the Hall current equivalent position and radius have important effects on the coupling intensity between the discharge and magnetic circuits. This causes a difference in the coupling coefficient for different operating conditions of Hall thrusters. Through non-intrusive methods for measuring the Hall current equivalent radius and the axial position, it is found that with an increase in the discharge voltage and magnetic field intensity, the Hall current equivalent radius increases and its axial position moves towards the exit plane. Thus, both the coupling coefficient and the coupling intensity between the discharge and magnetic circuits increase. Graphical abstract
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  • 3
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    On the size of the secondary electron cloud in crystals irradiated by hard X-ray photons (2017)
    Springer
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    Publication Date: 2017-03-22
    Description: A simple theoretical recipe is proposed to estimate the size of the secondary electron cloud, generated in matter by incoming hard X-ray photons. An exclusive response of the LiF crystal to deposited X-ray doses by proportional generation of secondary electrons, which cause creation of color centers density inside the crystal, provides a unique possibility to validate the theoretical predictions for the size of the electron cloud with submicron resolution. The radius of the electron cloud measured for 10.1 keV photons is in agreement with the theoretical predictions. Graphical abstract
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  • 4
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    Phonon-mediated nuclear spin relaxation in H 2 O (2017)
    Springer
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    Publication Date: 2017-03-22
    Description: A theoretical model of the phonon-mediated nuclear spin relaxation in H 2 O trapped by cryomatrices has been established for the first time. In order to test the validity of this model, we measured infrared spectra of H 2 O trapped in solid Ar, which showed absorption peaks due to rovibrational transitions of ortho- and para-H 2 O in the spectral region of the bending vibration. We monitored the time evolution of the spectra and analyzed the rotational relaxation associated with the nuclear spin flip to obtain the relaxation rates of H 2 O at temperatures of 5–15 K. Temperature dependence of the rate is discussed in terms of the devised model. Graphical abstract
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  • 5
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    Mass spectrometry of diffuse coplanar surface barrier discharge: influence of discharge frequency and oxygen content in N 2 /O 2 mixture* (2017)
    Springer
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    Publication Date: 2017-02-10
    Description: Diffuse Coplanar Surface Barrier Discharge (DCSBD) has been studied extensively for industrial applications in recent decade. So far, limited information was available on the production of ozone or nitrogen oxides important for industrial deployment of DCSBD. In this paper results of mass spectrometry of DCSBD performed at atmospheric pressure are presented. DCSBD mass spectra were studied for different oxygen contents in N 2 /O 2 working gas mixture at low flow rate (estimated residence time in discharge chamber was approx. 3 s). Influence of the driving frequency (15, 30 and 50 kHz) at constant high voltage amplitude was studied as well. Ozone and NO production in DCSBD are given as typical representatives. Production of ozone decreases with the driving frequency, which could be attributed to the gas heating at higher frequencies. Graphical abstract
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  • 6
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    Generalized Sturmians in the time-dependent frame: effect of a fullerene confining potential (2017)
    Springer
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    Publication Date: 2017-02-17
    Description: In this work we present a novel implementation of the Generalized Sturmian Functions in the time-dependent frame to numerically solve the time-dependent Schrödinger equation. We study the effect of the confinement of H atom in a fullerene cage for the 1 s → 2 p resonant transition of the atom interacting with a finite laser pulse, calculating the population of bound states and spectral density. Graphical abstract
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  • 7
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    Comparing numerical and analytical approaches to strongly interacting two-component mixtures in one dimensional traps (2017)
    Springer
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    Publication Date: 2017-02-17
    Description: We investigate one-dimensional harmonically trapped two-component systems for repulsive interaction strengths ranging from the non-interacting to the strongly interacting regime for Fermi-Fermi mixtures. A new and powerful mapping between the interaction strength parameters from a continuous Hamiltonian and a discrete lattice Hamiltonian is derived. As an example, we show that this mapping does not depend neither on the state of the system nor on the number of particles. Energies, density profiles and correlation functions are obtained both numerically (density matrix renormalization group (DMRG) and exact diagonalization) and analytically. Since DMRG results do not converge as the interaction strength is increased, analytical solutions are used as a benchmark to identify the point where these calculations become unstable. We use the proposed mapping to set a quantitative limit on the interaction parameter of a discrete lattice Hamiltonian above which DMRG gives unrealistic results. Graphical abstract
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  • 8
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    Double ionization of neon by electron impact: use of correlated wave functions* (2017)
    Springer
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    Publication Date: 2017-02-17
    Description: A model including correlation both in the initial state and in the final state is applied to the case of the double ionization of neon. The results of our model are compared to the available experimental data performed at high incident energy. Fully (fivefold) differential cross sections (FDCS) have been studied by applying the first Born approximation. Four ion states of Ne ++ , which are not resolved in the experiments, have been included in our calculation. Graphical abstract
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  • 9
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    Doubly excited states of molecular nitrogen by scattered electron-ion coincidence measurements (2017)
    Springer
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    Publication Date: 2017-03-01
    Description: Scattered electron-ion coincidence measurements were performed on molecular nitrogen (N 2 ) to study the relaxation dynamics of doubly excited states. Doubly excited states are typically so unstable that they result in either auto-ionization or a neutral dissociation. In auto-ionization, ionization and dissociation typically occur. Using a mixed-gas method, we determined the absolute values of the generalized oscillator strength (GOS) distributions using an incident electron energy of 200 eV and a scattering angle of 6°. The GOS distributions of N 2 + and N + were determined by combining the coincidence ion signals, which revealed some doubly excited states of N 2 . Since electron impact experiments can provide information on optically forbidden transitions, the contribution of optically forbidden states appears in the GOS distributions of both N 2 + and N + . We observed auto-ionization and dissociative auto-ionization induced by excitation to the optically forbidden doubly excited states in the range of 30–40 eV. Graphical abstract
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  • 10
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    Improving optical absorption in a-Si thin films with TiO 2 Mie scatterers (2017)
    Springer
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    Publication Date: 2017-05-17
    Description: To increase the optical absorption in very thin a-Si films is relevant for more efficient and inexpensive photovoltaics. In this work we deposited TiO 2 particles with a gas aggregation source on top of a-Si thin films and study the effect on optical absorption. When using thin films, anti-reflection and enhanced-reflection occurs depending on the thickness, which was employed in this study. The experiments were compared with finite difference time domain (FDTD) simulations which yielded good agreement. Both increased and decreased optical absorption was measured, depending on the photon energy range. This work demonstrates that by tailoring the various parameters, the TiO 2 particles can contribute to increasing the efficiency of an a-Si based solar cell. Graphical abstract
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