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    Wyświetlanie 1-15 z 15
    Tytuł:
    Temperature Dependence of the Self-Broadened 540.06 nm Neon Line
    Autorzy:
    Leo, P. J.
    Mullamphy, D. F. T.
    Peach, G.
    Venturi, V.
    Whittingham, I. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968841.pdf
    Data publikacji:
    1998-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.70.Jz
    34.20.Cf
    Opis:
    Quantum close-coupled calculations of the collisional self-broadening of the 540.06 nm neon line (3s[3/2]$\text{}_{1}$-3p'[1/2]$\text{}_{0}$) are presented for temperatures from 70 K to 900 K. These calculations are based on the quantum-mechanical impact theory of Baranger and represent the interatomic interaction by adiabatic molecular potentials calculated using model potentials for the electron- atom and atomic core-core interactions. The calculated widths and shifts vary smoothly with temperature and are accurately given across the temperature range by fourth order polynomial fits.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 3; 459-464
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The C$\text{}^{1}$Σ$\text{}^{+}$ State of KLi Studied by Polarisation Labelling Spectroscopy Technique
    Autorzy:
    Grochola, A.
    Kowalczyk, P.
    Jastrzębski, W.
    Crozet, P.
    Ross, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035622.pdf
    Data publikacji:
    2002-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Kf
    33.15.-e
    34.20.Cf
    Opis:
    The polarisation labelling spectroscopy method is applied to study the C$\text{}^{1}$Σ$\text{}^{+}$← X$\text{}^{1}$ Σ$\text{}^{+}$ band system of the KLi molecule. Rotationally resolved polarisation spectra are observed in the spectral range of 17150-20350 cm$\text{}^{-1}$. A set of Dunham coefficients describes the C$\text{}^{1}$Σ$\text{}^{+}$ state to 95% of its potential well depth, and the potential curve is constructed by the Rydberg-Klein-Rees procedure. The molecular parameters deduced from this work are compared with theoretical calculations.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 6; 729-738
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Broadening and Shift of the 326.1 nm Cd Line by He and Ne
    Autorzy:
    Bielski, A.
    Brym, S.
    Ciurylo, R.
    Domysławska, J.
    Lednev, M. G.
    Trawiński, R. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952749.pdf
    Data publikacji:
    1996-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.70.Jz
    33.70.Jg
    34.20.Cf
    Opis:
    The experimental values of pressure broadening and shift parameters of the 326.1 nm Cd line perturbed by He and Ne, are compared with those calculated from the adiabatic and nonadiabatic approaches to the impact theory for different interaction potentials.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 6; 1155-1167
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Differential Equation for Asymmetric Voigt Profile
    Autorzy:
    Ciuryło, R.
    Domysławska, J.
    Trawiński, R. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929159.pdf
    Data publikacji:
    1993-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.70.Jz
    33.70.Jg
    34.20.Cf
    Opis:
    The second-order differential equation for the asymmetric Voigt profile is presented, leading to a powerful and accurate method of determining the line shape parameters.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 4; 425-430
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of Intrinsic Defects in CaYAl₃O₇
    Autorzy:
    da C. Bispo, G.
    Jackson, R.
    Valerio, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1029677.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Bn
    61.72.-y
    34.20.Cf
    Opis:
    CaYAl₃O₇ presents a challenge for computer modelling techniques because of its site-occupancy disorder related to the Ca/Y shared site. Supercells were built to reproduce experimental results which have the best agreement and lowest lattice energy. The potential parameters were obtained by empirical fitting, and reproduced the structure to within 1.09%. Results obtained by supercell and the Mott-Littleton methods were compared. Both methods predict oxygen Frenkel defects are likely to be formed.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 781-784
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Pressure Effect on Glass Formation and Cluster Structure Evolution during Cooling Process of PdNi Alloy: A Molecular Dynamics Study
    Autorzy:
    Kazanc, S.
    Celik, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195946.pdf
    Data publikacji:
    2014-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.pe
    83.10.Rs
    34.20.Cf
    Opis:
    Based on the embedded atom method a molecular dynamics simulation technique has been used to study the glass formation and atomic short range order in Pd-Ni binary alloy. By using radial distribution functions and Honeycutt-Andersen pair analysis methods, the structural development of this alloy is studied by quenching from the liquid at two different cooling rates and under 0 and 5 GPa pressures. The results show that the variation of local atomic bonded pairs is of great importance to understand the glass formation process and increase of the number of the ideal icosahedra under high pressure contributes to more ideal glass formation of model alloy.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 1; 49-53
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Broadening and Shift of 326.1 nm Cd Line by Ar and Kr
    Autorzy:
    Brym, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1858145.pdf
    Data publikacji:
    1997-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.70.Jg
    32.70.Jz
    34.20.Cf
    Opis:
    Using the Baranger nonadiabatic impact theory for different interaction potentials the values of pressure broadening and shift parameters for the 326.1 nm Cd line perturbed by Ar and Kr were calculated. Results are compared with both experimental values and those calculated in our previous papers using an adiabatic treatment.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 3; 505-511
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Study of Positronic Atoms with Adiabatic Separation of Positronic Motion
    Autorzy:
    Strasburger, K.
    Wołcyrz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812552.pdf
    Data publikacji:
    2008-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.20.Cf
    31.50.Bc
    36.10.Dr
    Opis:
    A modified adiabatic approximation, with the positron treated as a light nucleus and its charge included only partially in the electronic Hamiltonian, was applied to compute the energies and properties of bound states of lithium positride, positronic beryllium and positronic magnesium. The electronic Schrödinger equation was solved with the configuration interaction method. No bound state was obtained for lithium positride, while the dissociation energies of positronic beryllium and positronic magnesium were underestimated by 2.6 and 7 millihartrees, respectively. Consequences for the applicability of the adiabatic approximation to describe positronic systems are discussed.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 5; 1533-1542
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some Remarks on Pressure Effects on 2p$\text{}^{5}$3p-2p$\text{}^{5}$ns (n=5, 6, 7) Transitions in Neon
    Autorzy:
    Bielski, A.
    Szudy, J.
    Trawiński, R. S.
    Wolnikowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920507.pdf
    Data publikacji:
    1992-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.70.Jz
    33.70.Jg
    34.20.Cf
    Opis:
    The collisional broadening and shift of 494.5 nm spectral line of neon arising from 2p$\text{}^{5}$3p-2p$\text{}^{5}$ns7s transition, emitted from a low-pressure glow discharge in pure neon and neon-helium mixtures have been measured. The values of pressure broadening and shift coefficients were determined. Experimental data of 494.5 nm line as well as our earlier results for spectral lines originating from the 2p$\text{}^{5}$3p-2p$\text{}^{5}$ns7s (n = 5, 6) transitions are compared with those resulting from the Kaulakys and Ueda theories of pressure effects on Rydberg states.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 3; 369-378
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A New Approach to Deriving Interatomic Many-Body Interactions in Metals
    Autorzy:
    Gurskii, Z.
    Krawczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992708.pdf
    Data publikacji:
    1998-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Nc
    71.15.Hx
    34.20.Cf
    Opis:
    An original method of treating the kinetic and exchange-correlation energies functionals in terms of many particle interactions was developed. It is based on utilizing the local density approximation. The total electron density, extracted from the ab initio band structure calculations, is expressed as a linear superposition of contributions from the individual pseudoions embedded in the uniform background. The explicit expressions for the pair and triplet potentials are presented. The general form for the part of the pair interatomic interactions caused by the kinetic and the exchange-correlation effects is obtained. Relationship between the developing approach and the perturbation theory in pseudopotential is analysed. Unlike the perturbation theory the advanced approach allows one to calculate accurately the so-called reducible contributions to the pair potential arising from the n -particle (n>2) interactions. It corresponds to summing certain series in pseudopotential. Contribution of the electron-nonlocal pseudopotential interactions to the pair interatomic ones is considered within the concept of the fully separable pseudopotentials.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 4; 671-682
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Asymmetric Voigt Profile and Complex Error Functions in Terms of the Kummer Functions
    Autorzy:
    Di Rocco, H. O.
    Aguirre Téllez, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041591.pdf
    Data publikacji:
    2004-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.70.Jz
    33.70.Jg
    34.20.Cf
    Opis:
    In this work we present the explicit representations of the Voigt function K(a,b) (the convolution between a Gaussian and a Lorentzian function), the function N(a,b) defined as the convolution of Gaussian and dispersion distributions as well as the complex error function erf(a+ib), all in terms of the Kummer functions M(α,γ,a$\text{}^{2}$). The expansions are valid for all values of the parameter a (the relation between Lorentzian and Gaussian widths at the half maxima). Previous analytical works were known only when the parameter a≤1, or were based on numerical interpolations or empirical approximations. Also, new series and asymptotic expansions are presented.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 6; 817-826
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response of Scanning Fabry-Pérot Interferometer to Speed-Dependent Asymmetric Voigt Profile
    Autorzy:
    Bielski, A.
    Brym, S.
    Ciuryło, R.
    Jurkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945728.pdf
    Data publikacji:
    1996-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.70.Jz
    33.70.Jg
    34.20.Cf
    Opis:
    A detailed analysis of the deviations from the Voigt profile caused by the correlation effects and collision-time asymmetry observed by means of a Fabry-P'erot interferometer is presented. An expression for the response of scanning Fabry-P'erot interferometer to the speed-dependent asymmetric Voigt profile is derived.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 3; 523-529
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exchange Charge Model for $Fe^{3+}:LiAl_{5}O_{8}$
    Autorzy:
    Vaida, M.
    Avram, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791224.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.70.Ch
    78.20.Bh
    34.20.Cf
    71.70.-d
    Opis:
    The aim of this paper is the theoretical investigation of $Fe^{3+}$ doped in the ordered phase of $LiAl_{5}O_8$. We used the shell model and pair potential approximation to optimize the geometric structure of $LiAl_{5}O_{8}$. This approach enables the modeling of the crystal field parameters of $LiAl_{5}O_8$ and then calculates the energy levels scheme of $Fe^{3+}$ ions doped in tetrahedral sites in the title crystal. Consistent crystal field analysis and the energy level splittings for $LiAl_{5}O_{8}$ doped with $Fe^{3+}$ ions was performed in the frame of the exchange charge model of crystal field. The comparison of the theoretically obtained results for energy levels with the experimental data, yields satisfactory agreement and confirms the validity of the exchange charge model.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 541-543
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Approximate Solutions of Schrödinger Equation under Manning-Rosen Potential in Arbitrary Dimension via SUSYQM
    Autorzy:
    Hassanabadi, H.
    Lu, L.
    Zarrinkamar, S.
    Liu, G.
    Rahimov, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418113.pdf
    Data publikacji:
    2012-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Ge
    02.30.Gp
    03.65.-w
    34.20.Cf
    Opis:
    The Schrödinger equation under the Manning-Rosen potential is solved in arbitrary dimension via the quantum mechanical idea of supersymmetry. The Pekeris approximation is used to overcome the inconsistency of the potential with the centrifugal term. Comments on the energy eigenvalue behavior versus dimension are included. The inter-dimensional degeneracy for various orbital quantum number l and dimensions D are studied. The expectation values of some physical parameters are reported via the Feynman-Hellmann theorem.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 4; 650-654
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling the Nonlinear Dynamics of Nanotube Cores Driven by Interlayer Dispersion Force Modulation: New Developments and Future Applications
    Autorzy:
    Pinto, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191757.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.20.Pe
    84.60.Ve
    85.85.+j
    42.50.Pq
    34.20.Cf
    Opis:
    Despite several past proposals to employ the inner cores of multiwalled nanotubes as, among others, ultra-high-frequency oscillators, memory devices, and nano-scale sensors, driving into motion a mass initially at rest within the nanotube outer walls has remained a crippling practical obstacle. In addition to the challenge of applying an external driving force upon the entirely embedded shuttle, it has been reported that the dynamics of such motion is "truly nonlinear", that is, it cannot be reduced to that of harmonic or nearly-harmonic oscillators even in the case of vanishing amplitudes. The author has shown that, since friction is nearly negligible, the inner core can be set into motion by breaking the high axial symmetry of the interlayer dispersion forces exerted on it by the outer walls. For instance, by fabricating nanotubes with even just two segments having slightly different dielectric properties, it was concluded that the motion of a partially extruded core under the action of an external electric field could be remarkably stabilized and electrical energy could be both stored into and released from the van der Waals field. Further significant progress was made by identifying a possible mechanism for the time-modulation of the spectral properties of double-walled nanotubes by acting on the free-carrier exciton screening in semiconducting nanotubes. In this paper, new developments are presented in the accurate mathematical modeling of these complex driven systems and additional future applications of telescoping nanotubes as actuators, non-electrochemical energy nanostorage systems, and neutral particle accelerators are illustrated.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 819-825
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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