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    Wyświetlanie 1-19 z 19
    Tytuł:
    Investigations of Electron Impact Induced Excitations from 3P to Higher Lying Levels of Sodium
    Autorzy:
    Stacewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929547.pdf
    Data publikacji:
    1993-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.Dp
    Opis:
    Results of measurements of the rate constants for the electron impact induced transitions between 3P and higher excited 3D, 4P, and 5S levels are presented. The experimental data were corrected for the radiation imprisonment using a new model of this effect.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 2; 259-269
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurements of Double Differential Cross-Sections for He at Intermediate Energy
    Autorzy:
    Ozer, Z.
    Olgac, F.
    Ulu, M.
    Aktas, B.
    Dogan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1194824.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.Dp
    Opis:
    Detailed studies on ionization of atoms and molecules by electron impact have made numerous contributions to understanding of the structure of atoms and molecules including the interaction between particles. After a ionizing collision a scattered electron, an ejected electron and a recoil ion is formed. Doubly differential cross-sections give detailed information for one of the outgoing electrons. In this study, we report the angular distribution of double differential cross-sections of ejected electrons from He in intermediate energy region.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 341-342
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of Double Differential Cross-Section for Electron Impact Ionization of Argon at 348 eV
    Autorzy:
    Bozkurt, G.
    Yavuz, M.
    Ozer, Z.
    Dogan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195074.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.Dp
    Opis:
    In this study, we report the angular distribution of double differential cross sections of ejected electrons from Ar in intermediate energy region. Double differential cross-sections for electron impact ionization of argon have been measured at 348 eV. A hemispherical energy analyzer is used to analyze the ejected electrons with energies between 25 and 325 eV and angles between 25° and 130°.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 343-344
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical-Excitation Function and Polarization of 4227-Å Resonance Line of Ca Excited by 8-500 eV Electron Impact
    Autorzy:
    Dziczek, D.
    Dyl, D.
    Piwiński, M.
    Chwirot, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968910.pdf
    Data publikacji:
    1998-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.Dp
    Opis:
    We report on measurements of the relative optical-excitation function for the 4$\text{}^{1}$P state of Ca and polarization degree of the 4227-Å resonance line. The measurements were carried out using crossed low-density beams of electrons and calcium atoms, for incident electron energies from 8 to 500 eV. For each electron energy we have used 28 results obtained at different polarizer positions from 0-180 ̊ to extract the required parameters. Excellent agreement between the present results and earlier predictions has been found.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 5-6; 717-721
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Double Differential Cross-Section Measurements for Electron Impact Ionization of Helium
    Autorzy:
    Özer, Z.
    Olgaç, F.
    Ulu, M.
    Doğan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399891.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.Dp
    Opis:
    The single ionizing collision with an incident electron and atom/molecules ends up two kinds of outgoing electrons called scattering and ejected electrons. As a feature of electron impact ionization these two electrons are indistinguishable. Double differential cross-sections can be obtained by the measurements of energy and angular distributions of one of the two outgoing electrons by a detector. In this perspective, we used He target that is reasonable to expect to understand ionization mechanisms of atomic systems. We have measured double differential cross-sections for asymmetric geometry for different kinematical situations. The experiments are carried out on a newly developed electron spectrometer constructed in Afyonkarahisar, Turkey.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 361-362
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarization and Optical Excitation Function of Resonance Radiation of Cadmium Atoms Excited by Electron Impact
    Autorzy:
    Dziczek, D.
    Piwiński, M.
    Grądziel, M.
    Chwirot, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035651.pdf
    Data publikacji:
    2003-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.Dp
    Opis:
    First measurements of polarization of 228.8 nm radiation emitted by cadmium atoms excited to the first singlet state (5 $\text{}^{1}$P$\text{}_{1}$) following impact of electrons were carried out for the electron energy range 20-500 eV. New data were also obtained on the relative optical excitation function up to electron energy of 500 eV, which extend lower energy results published previously by other researchers.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 1; 3-11
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Collisions between Li(2P) Atoms and Electrons: Excitation of 4l Levels
    Autorzy:
    Pietruczuk, A.
    Stacewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035742.pdf
    Data publikacji:
    2003-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.-i
    34.80.Dp
    Opis:
    Results of measurements of rate constants for transitions between 2P → 4S, 2 P → 4P, and 2P → 4D levels of lithium are presented. The investigations were performed in laser induced plasma. The results were compared with calculations based on Born and close coupling approach.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 5; 423-432
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observing Quantum Level Interference Effects with Electron Spectrometer
    Autorzy:
    Özer, Z.
    Ulu, M.
    Aktaş, B.
    Doğan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399893.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.Dp
    34.50.Gb
    Opis:
    The existence of Young-type interference patterns has been recently searched in triple differential cross-sections for single ionization of $H_2$ molecules by electron impact, and theoretically supported by calculations obtained by different models. The appearance of interference effects arising from the two-centre geometry of diatomic molecule. These effects seen in triple differential cross-sections are described by interference factor in analogy with light waves. In this work, we discuss about that the interference factor for molecular structure of $H_2$ may reproduce Young-type interference patterns depending on scattering angle, initial and ejected electron energies in triple differential cross-sections. Differences are expected in the triple differential cross-sections spectra of ejected electrons according to kinematical conditions imposed by scattering angle and electron energy.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 363-364
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semirelativistic 1s-2s Excitation of Atomic Hydrogen by Electron Impact
    Autorzy:
    Taj, S.
    Manaut, B.
    Oufni, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504562.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.Dp
    12.20.Ds
    Opis:
    In the framework of the first Born approximation, we present a semirelativistic theoretical study of the inelastic excitation $(1s_{1/2} \rightarrow 2s_{1/2})$ of hydrogen atom by electronic impact. The incident and scattered electrons are described by a free Dirac spinor and the hydrogen atom target is described by the Darwin wave function. Relativistic and spin effects are examined in the relativistic regime. A detailed study has been devoted to the nonrelativistic regime as well as the moderate relativistic regime. Some aspects of this dependence as well as the dynamic behavior of the differential cross-section in the relativistic regime have been addressed.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6; 769-773
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single Ionization of He by High-Energy Proton and Antiproton. A QED Approach
    Autorzy:
    Bhattacharyya, S.
    Pathak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014235.pdf
    Data publikacji:
    2000-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.Dp
    82.30.Fi
    Opis:
    We have investigated single ionization of He by fast proton and antiproton using a QED approach. A field theoretical calculation gives the total cross-section of He in single ionization, from which it is seen that the projectile p$\text{}^{+}$ or p$\text{}^{-}$ gives almost the same values of cross-section. We have also compared our results with other theoretical and experimental results available in this context yet. Behaviour of the cross-section at a lower spectrum of projectile energy is discussed.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 4; 335-344
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical study of atomic excitation by impact of protons in the variational formalism
    Autorzy:
    El Houda Benmansour, N.
    Bouamoud, M.
    Sahlaoui, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1068150.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.Dp
    34.50.Fa
    95.30.Dr
    Opis:
    Schwinger's variational principle is used to evaluate excitation cross-sections of hydrogen atom by proton impact in a range of energies excluding a pertubative treatment. To describe the strong coupling between the excitation and the capture channels that exists at low energies, the continuum states have been introduced in the total wave function. Our results show that these states can describe properly the projectile capture states.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 145-146
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluorescence of Sodium Vapour Excited by 330 nm Laser Pulses
    Autorzy:
    Gorbunov, N. A.
    Kozłowski, P.
    Nowak, K.
    Stacewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2025779.pdf
    Data publikacji:
    2001-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.80.Wr
    34.80.Dp
    46.65.+g
    Opis:
    We report results of investigation on the fluorescence induced in sodium vapour by pulses of laser light tuned near the 3S → 4P transition (330 nm). The fluorescence was observed in perpendicular and parallel directions in respect to the laser beam. A depletion of fluorescence intensity corresponding to the 5D → 3P transition (498 nm) was observed along the laser beam. We explain this effect as a result of reabsorption that is caused by intense population of the 3P level due to cascade stimulated processes. The most intense depletion occurs about 20 ns after the laser pulse and it corresponds to the moment of maximal population of the 3P level.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 5; 531-537
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tailoring the Internal Evaporator for Effective Ion Beam Production - Volatile vs. Non-Volatile Substances
    Autorzy:
    Turek, M.
    Droździel, A.
    Pyszniak, K.
    Prucnal, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402239.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.Ka
    34.80.Dp
    61.72.uj
    Opis:
    Two different designs of the internal evaporator in an arc discharge ion source are presented, suitable either for volatile, or high-melting point substances. A matter of the evaporator size and placement in order to obtain its appropriate temperature and, therefore, a stable and intense ion beam, is considered. Basic ion source characteristics, i.e. the dependences of ion current and discharge voltage on the discharge and filament currents as well as on the external magnetic field flux density are shown and discussed in order to find optimal working conditions. The results of measurements for both volatile (P, Zn, Se, S) and non-volatile (Pd) are presented, showing the applicability of the design for ion implantation purposes.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 939-942
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of $Mo^{+}$ Beams Using an Arc Discharge Ion Source
    Autorzy:
    Turek, M.
    Droździel, A.
    Pyszniak, K.
    Prucnal, S.
    Mączka, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1383005.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.Ka
    34.80.Dp
    61.72.uj
    Opis:
    A new method of $Mo^{+}$ ion beam production is presented in the paper. The method bases on the chemical sputtering/etching of the molybdenum parts (e.g. anode) of the arc discharge ion source by the chloride containing plasma. A mixture of $CCl_4$ (or $CHCl_3$) vapor and air was used as the feeding substance. The separated $Mo^{+}$ beam current of approximately 18 μA was achieved. The measurements of the ion current dependences on the discharge and filament currents as well as on the magnetic field flux density from the electromagnet surrounding the discharge chamber were performed in order to find the optimal working parameters of the ion source.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1388-1391
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of Molybdenum and Tantalum Ion Beams using CCl₂F₂
    Autorzy:
    Turek, M.
    Droździel, A.
    Pyszniak, K.
    Filiks, J.
    Prucnal, S.
    Mączka, D.
    Vaganov, Yu.
    Węgierek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033135.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.Ka
    34.80.Dp
    61.72.uj
    Opis:
    A new method of refractory metal (like Mo and Ta) ion beam production using the arc discharge ion source and CCl₂F₂ (dichlorodifluoromethane) used as a feeding gas supported into the discharge chamber is presented. It is based on etching of the refractory metal parts (e.g. anode or a dedicated tube) Cl and F containing plasma. The results of measurements of the dependences of ion currents on the working parameters like discharge and filament currents as well as on the magnetic field flux density of an external electromagnet coil are shown and discussed. The separated Mo⁺ and Ta⁺ beam currents of approximately 22 μA and 2 μA, respectively, were obtained.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 283-287
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of Doubly Charged Ions Using a Hollow Cathode Ion Source with an Evaporator
    Autorzy:
    Turek, M.
    Droździel, A.
    Pyszniak, K.
    Mączka, D.
    Słowiński, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400444.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.Ka
    34.80.Dp
    61.72.uj
    Opis:
    The paper describes the production of doubly charged ions from solids and gases using a hollow cathode ion source with an internal evaporator heated by a spiral cathode filament and arc discharge. The obtained currents were 15 μA for $Bi^{2+}$, 10 μA for $As^{2+}$ and $Al^{2+}$, 8 μA for $Kr^{2+}$ and $Xe^{2+}$, 5 μA for $In^{2+}$ and $Ge^{2+}$, enabling moderate dose implantations ( ≈ $10^{15} cm^{-3}$) with doubly charged ions. Characteristics of the ion source are presented and discussed in order to choose the optimal working parameters. A brief presentation of numerical model of doubly and singly charged ions in the ion source is given. The calculated results (dependences of ion current on the anode voltage) are in good agreement with the experimental data.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 843-846
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculations of the Atomic Structure for Fe XVII Lines
    Autorzy:
    Zhou, Chao
    Cao, Jian-Jian
    Liang, Liang
    Yu, Geng-Hua
    Wang, Zhan-Min
    He, Hua-Yue
    Powiązania:
    https://bibliotekanauki.pl/articles/1398915.pdf
    Data publikacji:
    2016-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Rj
    32.70.Cs
    34.80.Dp
    Opis:
    Energy levels, line strengths, oscillator strengths, radiative decay rates and fine structure collision strengths are presented for sixteen-times ionized iron (Fe XVII). The atomic data are calculated with the AUTOSTRUCTURE code, where relativistic corrections are introduced according to the Breit-Pauli distorted wave approach. The calculations of atomic data for 89 fine-structure levels generated from eleven configurations 2s²2p⁶, 2s²2p⁵ (3s, 3p, 3d), 2s²2p⁵ (4s, 4p, 4d, 4f) and 2s¹2p⁶ (3s, 3p, 3d) of the Ne-like Fe ion are presented. Fine structure collision strengths for transitions from the ground and the first four excited levels are presented at four electron energies: 75, 125, 175, and 250 Ry. These atomic structure data are compared with the available experimental and theoretical results.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 6; 1109-1117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plasma Ion Source with an Internal Evaporator
    Autorzy:
    Turek, M.
    Droździel, A.
    Pyszniak, K.
    Prucnal, S.
    Mączka, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504137.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.Ka
    34.80.Dp
    61.72.uj
    Opis:
    A new construction of a hollow cathode ion source equipped with an internal evaporator heated by a spiral cathode filament and arc discharge is presented. The source is especially suitable for production of ions from solids. The proximity of arc discharge region and extraction opening enables production of intense ion beams even for very low discharge current ($I_{a}$ = 1.2 A). The currents of 50 μA $(Al^{+})$ and 70 μA $(Bi^{+})$ were obtained using the extraction voltage of 25 kV. The source is able to work for several tens of hours without maintenance breaks, giving possibility of high dose implantations. The paper presents the detailed description of the ion source as well as its experimental characteristics like dependences of extracted currents and anode voltage on anode and cathode currents.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 184-187
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy-Loss of Positrons in Foils
    Autorzy:
    Schneider, H.
    Tobehn, I.
    Rückert, M.
    Brinkmann, U.
    Hippler, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929110.pdf
    Data publikacji:
    1993-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.77.+p
    29.25.-t
    34.80.Dp
    Opis:
    The Giessen slow positron source TEPOS delivers intense beams in the energy range between some eV and 6 keV; with postacceleration up to 80 keV. Results for remoderation are described shortly. Further the energy-losses of positrons with incident energy of 6-20 keV through thin aluminium foils were measured. Cross sections for K- and L-shell ionization of thin silver and gold targets by positron and electron impact have been determined at projectile energies of 30-70 keV. The experimental results are presented in detail; they are confirmed by calculations in plane-wave-Born approximation which include an electron exchange term and account for the deceleration or acceleration of the incident projectile in the nuclear field of the target atom.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 3; 375-380
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-19 z 19

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