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Wyszukujesz frazę "Sobczak, M." wg kryterium: Autor


Wyświetlanie 1-6 z 6
Tytuł:
Use of Bersons-Kulsh Form Factor of Short-Pulse Approximation in Rydberg-State Physics
Autorzy:
Parzyński, R.
Sobczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2035652.pdf
Data publikacji:
2003-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Rm
03.65.Ge
Opis:
The experiments on high Rydberg states interacting with short electromagnetic pulses were hitherto mainly explained by using numerical integration of the time-dependent Schrödinger equation in a restricted state basis. In this study we apply a different approach based on the Bersons-Kulsh analytical form factor of the short-pulse approximation. This analytical approach is shown to well reproduce the recent experimental results and those of numerical integration of the time-dependent Schrödinger equation both in the case of terahertz half-cycle pulses and optical many-cycle pulses. This fact enables a recommendation of the analytical Bersons-Kulsh form factor as an alternative and efficient method of quantum calculations of electromagnetically induced Rydberg state redistribution.
Źródło:
Acta Physica Polonica A; 2003, 103, 1; 13-23
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Iterative Method for Extreme Optics of Two-Level Systems
Autorzy:
Parzyński, R.
Sobczak, M.
Plucińska, A.
Powiązania:
https://bibliotekanauki.pl/articles/2041593.pdf
Data publikacji:
2004-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Md
42.50.Hz
42.65.Ky
42.65.Re
Opis:
We formulate the problem of a two-level system in a linearly polarized laser field in terms of a nonlinear Riccati-type differential equation and solve the equation analytically in time intervals much shorter than half the optical period. The analytical solutions for subsequent intervals are then stuck together in an iterative procedure to cover the whole scale time of the laser pulse. Very good quality of the iterative method is shown by recovering with it a number of subtle effects met in earlier numerically calculated photon-emission spectra from model molecular ions, double quantum wells, atoms, and semiconductors. The method is used to describe novel, carrier-envelope offset phase effects in the region of extreme nonlinear optics, i.e., when two-level systems are exposed to pulses of only a few cycles in duration and strength ensuring the Rabi frequency to approach the laser light frequence.
Źródło:
Acta Physica Polonica A; 2004, 106, 6; 827-842
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Substrate on Size of Pd Nanoparticles in C-Pd Composites Obtained in the PVD and CVD Processes
Autorzy:
Sobczak, K.
Kozłowski, M.
Czerwosz, E.
Powiązania:
https://bibliotekanauki.pl/articles/1032958.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.23.Pq
81.07.Bc
81.15.Gh
82.45.Mp
Opis:
This paper presents the results of research of C-Pd composite films obtained by the physical vapor deposition and chemical vapor deposition method. These films will be applied as hydrogen sensors. It has been examined whether the substrate has an impact on morphology and topologies of the C-Pd composite and whether the thermal conductivity of the substrate has an impact on the average size of the Pd nanoparticles. Substrates such as Al₂O₃, SiO₂, Si, and Mo were used, and in the physical vapor deposition process fullerene (C₆₀) and palladium acetate were deposited. Some of the samples were examined microscopically, while another part was modified in the chemical vapor deposition process in the presence of xylene. It was found that the average size of the Pd nanoparticles prepared in the physical vapor deposition process is independent of the substrate for all of the substrates used in the present experiment. During the chemical vapor deposition process an increase of the size of the Pd nanoparticles was observed - as expected. What is more, we noticed a weak relation between the size of the Pd nanoparticles and the type of substrate on which the C-Pd composite was deposited.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1413-1416
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Studies of C-Ni-Pd Nanocomposite Films Deposited on Al₂O₃ Substrate
Autorzy:
Kozłowski, M.
Czerwosz, E.
Sobczak, K.
Kurowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1032987.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.23.Pq
81.07.Bc
81.15.Gh
82.45.Mp
Opis:
The properties of nanocomposite carbon-nickel-palladium (C-Ni-Pd) films deposited on Al₂O₃ substrate have been investigated and the results are presented in this work. C-Ni-Pd films were obtained by a 3 step process consisting of PVD/CVD/PVD methods. The structure and morphology of the obtained films were characterized by scanning electron microscopy and transmission electron microscopy techniques at various stages of film formation. Energy dispersive X-ray spectrometer was used for measuring the elements segregation in the obtained film. Transmission electron microscopy and scanning transmission electron microscopy observations have shown carbon nanotubes decorated with palladium nanoparticles in the final film. The average size of the palladium nanoparticles did not exceed 10 nm.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1409-1412
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bremsstrahlung Isochromat Study of Si(111) by 6.2 eV Photons
Autorzy:
Sobczak, L.
Guichar, G. M.
Hamdache, R.
Sebenne, C.
Powiązania:
https://bibliotekanauki.pl/articles/1887643.pdf
Data publikacji:
1991-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.25.Rk
73.20.At
Opis:
We present the first experimental bremsstraldung isochromats at an extremal low photon energy of 6.2 eV measured by using a grating spectrometer placed in the air outside the ultra-high-vacuum chamber. Isochromats of the Si(111) cleaved surface have been measured for normal incidence of electrons. We have found that a free electron approximation for the initial electron state is quite good for the interpretation of bulk interband traηsitions occurring in the 6.2 eV isochromat of Si(111). A strong sensitivity for surface roughness of the 6.2 eV isochromat is observed.
Źródło:
Acta Physica Polonica A; 1991, 79, 5; 745-750
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropy, Geometric Structure and Frustration Effects in Molecule-Based Nanomagnets
Autorzy:
Kamieniarz, G.
Kozłowski, P.
Antkowiak, M.
Sobczak, P.
Ślusarski, T.
Tomecka, D.
Barasiński, A.
Brzostowski, B.
Drzewiński, A.
Bieńko, A.
Mroziński, J.
Powiązania:
https://bibliotekanauki.pl/articles/1426672.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Xx
75.10.Jm
75.10.Pq
75.40.Cx
Opis:
In this paper we review our results of comprehensive study of molecular nanomagnets recently synthesized in the form of the chromium-based molecules and bimetallic copper-containing chains as well as we present some new findings. We focus on effects of anisotropy, geometry and frustration appearing in various thermodynamic properties of the nanoscale magnets which are described by Heisenberg-like spin models and simulated by accurate numerical methods. We show that bond-dependent exchange anisotropy is needed to model magnetic torque in the Cd-doped chromium ring. We argue that only in the limit of infinite rings (n → ∞) frustration can be considered as the opposite to bipartiteness in the odd numbered (3 ≤ n ≤ 9) s = 3/2 quantum spin rings. We analyse the influence of exchange interactions and anisotropy on magnetic susceptibility of bimetallic (S = 3/2, s = 1/2) chains composed of Cu ions linked to different 3d ions by fitting experimental data. We reach the remarkable consistency of the density functional theory estimates of the magnetic couplings in $Cr_8$ molecule and provide strong support to the spin models exploited in the literature.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 992-998
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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