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    Wyświetlanie 1-7 z 7
    Tytuł:
    Properties of the $K_{α}$ X-Ray Transitions in Highly Ionized Chlorine
    Autorzy:
    Jiang, C.
    Hu, F.
    Zang, Y.
    Jiang, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1204977.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.V-
    31.30.jc
    Opis:
    Relativistic configuration interaction calculations with the inclusion of the Breit interaction, quantum electrodynamics and finite nuclear mass corrections have been carried out in the extended optimal level scheme using multi-configuration Dirac-Fock wave functions on the wavelengths, electric dipole transition rates and oscillator strengths of chlorine. Through the use of the active space method, the calculated values are compared with the other available data on He-like and Be-like chlorine and are found to be in very good agreement with them. In this paper we give accurate transition properties from Cl(VIII) through Cl(XVI). These data provide reference value for level lifetime, charge state distribution and average charge of chlorine plasma.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 694-699
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy Levels and Oscillator Strength of Ni XXIII
    Autorzy:
    Hu, F.
    Jiang, G.
    Yang, J.
    Zhang, J.
    Zhao, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493444.pdf
    Data publikacji:
    2011-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.V-
    31.30.jc
    Opis:
    Energy levels and oscillator strengths have been calculated for the fine-structure transitions among the levels of the $(1s^2) 2s^2 2 p^2,$ $2s2 p^3,$ $2p^4,$ $2s^2 2p3s,$ $2s^2 2p3p,$ and $2s^2 2p3d$ configurations of Ni XXIII using the graspVU and FAC program. The extensive configuration interaction and relativistic effects have been included while generating the wave functions. The results are compared with other recent theoretical estimates, and their accuracy is assessed.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 3; 429-437
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric Interaction between Two Identical Conducting Spheres in a Uniform Electric Field
    Autorzy:
    Gao, X.
    Wang, Q.
    Li, C.
    Hu, L.
    Sun, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401870.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.Cv
    47.65.Gx
    Opis:
    An experimental apparatus is devised to measure the interaction between two spheres separated by a small gap in a uniform electric field. The results show that the interaction between two conducting spheres is near that between two dielectric spheres with high permittivity. Accordingly, the calculation can be simplified by mirror image method, for it is only available for conducting system. A method using multiple mirror images of point charges is put forward to analyze the induction of two identical conducting spheres in a uniform electric field. The key operation on how to add compensative charges is emphasized and given out in detail. The results from experiment and calculation are compared, and they agree with each other very well.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 289-293
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations on the EPR Parameters of $KMgF_3$:$Cr^{+}$
    Autorzy:
    Kuang, M.
    Wu, S.
    Hu, X.
    Li, G.
    Zu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1365348.pdf
    Data publikacji:
    2014-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Dg
    76.30.Fc
    Opis:
    The electron paramagnetic resonance parameters (i.e., g factor, hyperfine structure constant and superhyperfine parameters) of $KMgF_3$:$Cr^{+}$ are theoretically investigated from the perturbation formulae of these parameters for an octahedral $3 d^5$ cluster. As for the calculations of g factor and hyperfine structure constant, both the contributions from the crystal-field and charge transfer mechanisms are included based on the cluster approach. The metal to ligand charge transfer contribution to the g-shift Δg ( ≈ g-2.0023) is the same (negative) in sign and much larger in magnitude as compared to the crystal-field one. The conventional argument that the charge transfer contributions to zero-field splittings are negligible for $3 d^5$ ions in fluorides is no longer suitable for Δg analysis of $KMgF_3$:$Cr^{+}$ due to the dominant second-order charge transfer perturbation term. The charge transfer contribution to hyperfine structure constant exhibits the same sign and about 4% of the crystal-field one. The unpaired spin densities of the fluorine 2s, 2pσ and 2pπ orbitals are quantitatively acquired from the relationships with the relevant molecular orbital coefficients using the uniform model. The present treatments are superior to the previous calculations of directly fitting the experimental superhyperfine parameters.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 5; 1224-1228
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence of Donor-Doped ZnSe Films Grown by Molecular Beam Epitaxy
    Autorzy:
    Karczewski, G.
    Hu, B.
    Yin, A.
    Luo, H.
    Dobrowolska, M.
    Furdyna, J. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932090.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    78.55.Et
    Opis:
    We studied the effect of the donor doping of ZnSe films on their photoluminescence properties. The samples were doped during the molecular beam epitaxy growth, either with gallium or with chlorine. As the dopant concentration dose increases, the intensity of the band-edge emission first saturates, and then quenches in favor of the deep-level photoluminescence band. The main effect of donor doping on photoluminescence is a strong increase in intensity of the donor-bound exciton line, referred to as I$\text{}_{2}$. For Ga-doped films deep-band emission is much stronger, and the I$\text{}_{2}$-line is slightly weaker than for Cl-doped films with comparable doping level. The results confirm the superiority of chlorine over gallium as an n-type dopant in ZnSe. We discuss the photoluminescence results and relate them to deep level transient spectroscopy data obtained on the same samples.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 245-248
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Predictions of Lattice Parameters and Mechanical Properties of Pentaerythritol Tetranitrate under the Temperature and Pressure by Molecular Dynamics Simulations
    Autorzy:
    Tan, J.J.
    Hu, C.
    Li, Y.
    Ge, N.
    Chen, T.
    Ji, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033453.pdf
    Data publikacji:
    2017-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    molecular dynamics
    lattice parameter
    equation of state
    elasticity
    mechanical properties
    Opis:
    Molecular dynamics simulations with condensed-phase optimized molecular potentials for atomistic simulation studies force field are performed to investigate the structure, equation of state, and mechanical properties of high energetic material pentaerythritol tetranitrate. The equilibrium structural parameters, pressure-volume relationship and elastic constants at ambient conditions agree excellently with experiments. In addition, fitting the pressure-volume data to the Birch-Murnaghan or Murnaghan equation of state, the bulk modulus B₀ and its first pressure derivative B'₀ are obtained. Moreover, the elastic constants are calculated in the pressure range of 0-10 GPa at room temperature and in the temperature range of 200-400 K at the standard pressure, respectively. By the Voigt-Reuss-Hill approximation, the mechanical properties such as bulk modulus B, shear modulus G, and the Young modulus E are also obtained successfully. The predicted physical properties under temperature and pressure can provide powerful guidelines for the engineering application and further experimental investigations.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 2; 318-323
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optically Detected Magnetic Resonance of Excess Electrons in CdTe/(Cd,Mg)Te Quantum Wells
    Autorzy:
    Hu, C. Y.
    Ossau, W.
    Yakovlev, D. R.
    König, B.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1969094.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.70.Hb
    71.35.-y
    71.35.Ji
    Opis:
    The spin resonance of excess electrons is observed with the detection either on the neutral or the negatively charged exciton X$\text{}^{-}$ emission in type I CdTe/(Cd,Mg)Te quantum wells with excess electrons of low density. It is found that the electron spin-dependent and electron spin-conserving formation and recombination of X$\text{}^{-}$ make the optical detection of the spin resonance of excess electrons feasible. For the first time, optically detected magnetic resonance is used to study fast optical transition processes in the nanosecond timescale where the microwave-induced magnetic transition rate is much lower than the optical transition rate.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 351-354
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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