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    Wyświetlanie 1-10 z 10
    Tytuł:
    Some Problems in Quantitative Auger Analysis of Metallic Alloys
    Autorzy:
    Mróz, S.
    Doliński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892438.pdf
    Data publikacji:
    1992-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Fv
    68.35.Dv
    Opis:
    Factors determining the Auger signal intensity are discussed. It is indicated that using standards is the only reasonable way for quantitative Auger analysis (QAA). Approaches to QAA without and with matrix corrections are presented. It is shown that the matrix correction connected with atomic concentrations of pure standards is the most important and that the other matrix corrections (e.g. those connected with the attenuation length and backscattering factor) do not improve appreciably the QAA exactness in many examples taken from the literature. The examples indicate that in the case of metallic alloys the properly performed QAA gives the relative atomic concentrations with the error not exceeding few percent.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 2; 201-210
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SEM Characterization of Multilayer Structures
    Autorzy:
    Aristov, V. V.
    Dryomova, N. N.
    Kireev, V. A.
    Razgonov, I. I.
    Yakimov, E. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1924322.pdf
    Data publikacji:
    1993-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Fv
    68.35.Dv
    Opis:
    The possibilities of non-destructive multilayer structure characterization using the backscattering electron and modulated cathodoluminescence modes of the SEM have been discussed. It is shown that these techniques allow one to measure the parameters of thin layers of the thickness of about 10 nm.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 1; 81-86
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reflection Electron Energy Loss Spectroscopy of Alkali Metals on Silicon
    Autorzy:
    Kleint, Ch.
    Abd El-Halim, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892213.pdf
    Data publikacji:
    1992-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.-r
    79.20.Fv
    79.20.Hx
    Opis:
    In an extended introduction studies of alkali adsorption on clean silicon surfaces are shortly reviewed and recent achievements are outlined. The main part describes our investigations of lithium and potassium adsorption by reflection electron energy loss spectroscopy (REELS). Beside (electronic) valence electron excitations also core losses of both silicon and these alkali metals were observed in the ionization loss spectroscopy mode (ILS). Additional information has been obtained by Auger electron spectroscopy (AES) and measurements of work function changes (WFC). The spectra of Li and K adsorption on the Si(100) plane show considerable differences which will be discussed in detail. By simulation of the REEL potassium spectra within the density of states (DOS) model using the Si(100)2 × 1 K DOS by R. Ramirez the origin of the 8.4 and 12.5 eV loss peaks can be traced to band structure features. In addition the known K peaks at 18.1, 20 and 22 eV are confirmed and their behaviour with increasing primary energy E$\text{}_{p}$, was investigated. While the K 3p-K 4s transition corresponding to the 18.1 eV loss increases with E$\text{}_{p}$, the dipole-forbidden K 3p-K 4p transition (20 eV) decreases. Shifts in the loss energy of these peaks as well as in the core loss energies at 295 and 296.8 eV are observed and explained by charge transfer.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 1; 47-65
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Correspondence of the Experimental EEL Spectra with the Electron Structure of Tungsten
    Autorzy:
    Czyżewski, J.J.
    Krajniak, J.
    Klein, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892216.pdf
    Data publikacji:
    1992-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Fv
    61.80.Mk
    82.65.-i
    Opis:
    In the previous paper [7] we have directly compared the experimental Electron Energy Loss (EEL) spectra with both the theoretical bulk density-of-states (BDOS) and surface density-of-states (SDOS) functions for tungsten. On the base of the ILEED intensity calculations we have estimated to what extend an EEL spectrum measured at some value of the primary electron energy E$\text{}_{p}$, should correspond either to the SDOS or to the BDOS. Also, the angular acceptance of a CMA has been used to separate the EEL spectra measured as a function of E$\text{}_{p}$ which corresponded either to the [001] direction or to the [011] in parallel to the studied (001) surface. In the present paper we propose a procedure which combines the Electron Energy Loss Spectra (EELS) simulation method based on Bauer's theory [1,2] and the inelastic low energy diffraction (ILEED). If the standard simulation procedure is applied for tungsten an ambiguity would arise because the DOS function is very anisotropic and varies as a function of both the direction along the surface and the depth considered within several atomic layers. The application of ILEED has supplemented the simulation procedure with the method which identifies both the correspondence of a reciprocal-lattice vector to a measured EEL spectrum and the localization of a studied electron structure with regard to the distance from the surface.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 1; 67-72
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inelastic Mean Free Paths of Low-Energy Electrons in Solids
    Autorzy:
    Tanuma, S.
    Powell, C. J.
    Penn, D. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892433.pdf
    Data publikacji:
    1992-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.80.Pv
    79.20.Fv
    79.60.-i
    78.90.+t
    Opis:
    We present a summary of recent calculations of the electron inelastic mean free paths (IMFPs) of 50-2000 eV electrons in 27 elements and 15 inorganic compounds. These calculations are based in part on experimental optical data to represent the dependence of the inelastic scattering probability on energy loss and the theoretical Lindhard dielectric function to represent the dependence of the scattering probability on momentum transfer. The calculated IMFPs for the elements were fitted to a modified form of the Bethe equation for inelastic electron scattering in matter and the four parameters in this equation were empirically related to other material parameters. The resulting formula, designated TPP-2, provides a convenient means for predicting IMFPs in other materials. We have used two powerful integral equations or sum rules to evaluate the optical data on which our IMFP calculations are based. While the optical data for the elements satisfied these sum rules to an acceptable degree, there were significant deviations in the data for the compounds. In addition, differences in IMFPs calculated from the optical data for the compounds and the values predicted by TPP-2 correlated with the average errors of the optical data as determined by the sum rules. IMFPs calculated from TPP-2 for these compounds are therefore believed to be more reliable than IMFPs obtained from the imperfect optical data.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 2; 169-186
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Comparison of the Information Depth of AEAPS, DAPS and AES
    Autorzy:
    Hucek, S.
    Pavluch, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892436.pdf
    Data publikacji:
    1992-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.80.Pv
    79.20.Fv
    Opis:
    The information depths of AEAPS and DAPS for the Ti and Cr L$\text{}_{3}$, L$\text{}_{2}$ and L$\text{}_{1}$ subshell excitation and of AES for the Ti L$\text{}_{3}$M$\text{}_{2,3}$M$\text{}_{2,3}$, L$\text{}_{3}$M$\text{}_{2,3}$M$\text{}_{4,5}$ and Cr L$\text{}_{3}$M$\text{}_{2,3}$M$\text{}_{4,5}$ transitions were determined. A set of Cr samples with Ti overlayers had been prepared in situ. Measurements of the LEAPS and HEAPS signal amplitudes were used to derive the AEAPS and DAPS signal intensities. The results showed that both AEAPS and DAPS had lower information depths compared with AES. They are interpreted in terms of the mean free paths of the majority of electrons contributing to the AEAPS signal.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 2; 187-191
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Core-Hole Screening on Spin-Polarised Auger Spectra from Ferromagnetic Ni
    Autorzy:
    Wegner, T.
    Potthoff, M.
    Nolting, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013223.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Fv
    71.20.Be
    75.60.Ej
    Opis:
    We calculate the spin- and temperature-dependent local density of states for ferromagnetic Ni in the presence of a core hole at a distinguished site in the lattice. Correlations among the valence electrons and between valence and core electrons are described within a multi-band Hubbard model which is treated by means of second-order perturbation theory around the Hartree-Fock solution. The core-hole potential causes strong screening effects in the Ni valence band. The local magnetic moment is found to be decreased by a factor of 5-6. The consequences for the spin polarisation of CVV Auger electrons are discussed.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 567-570
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Submonolayer Coverages Using Auger Escape Depths
    Autorzy:
    Godowski, P. J.
    Hardegree, E. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931323.pdf
    Data publikacji:
    1994-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Fv
    68.10.Jy
    82.65.My
    Opis:
    A simple method for determining submonolayer adsorbate coverages by means of Auger electron spectroscopy is presented. The procedure is based on the ratio of low to high kinetic energy Auger signals from the substrate alone, therefore it does not require a direct measurement of adsorbate peaks. It may be of special interest in cases where the adsorbate signal is difficult or impossible to measure, as well as when adsorbate and substrate peaks overlap or when peaks are absent (H or He) or of low intensity. The method is tested by quantification of sulphur layer on the Ni(001) and on the polycrystalline iron surface.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 5; 843-848
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Inelastic Mean Free Path of Electrons in Noble Metals
    Autorzy:
    Doliński, W.
    Mróz, S.
    Palczyński, J.
    Gruzza, B.
    Bondot, P.
    Porte, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892437.pdf
    Data publikacji:
    1992-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.10.Fk
    79.20.Fv
    Opis:
    The experimental values of Inelastic Mean Free Path (λ$\text{}_{IMFP}$) of electrons in noble metals (Ag, Au, Cu) are determined in the electron energy range 150-2000 eV. The method used consists of the measurements and theoretical calculations of the coefficient of elastic backscattering of electrons from a solid surface η$\text{}_{e}$. The obtained values of λ$\text{}_{IMFP}$ are compared with the data available in the literature.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 2; 193-199
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Angular Distributions of Secondary Electrons Emitted from the Polycrystalline Silver
    Autorzy:
    Doliński, W.
    Palczyński, J.
    Mazur, P.
    Gieniec, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892474.pdf
    Data publikacji:
    1992-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Hx
    79.20.Fv
    34.80.Bm
    Opis:
    The angular distributions of secondary electrons (including Auger electrons) of different energies emitted from polycrystalline silver bombarded with primary electrons (E$\text{}_{p}$ = 1000 and 2500 eV) were measured with a RFA analyzer equipped with an additional collector (acceptance angle ≈ 4°). Additionally, the angular distributions of primary electrons of different energies elastically backscattered from the same sample were also investigated by means of a specially constructed rotable RFA analyzer equipped with a channeltron. The results obtained show the cosine distribution of secondary and Auger electrons emitted as shown previously in the literature. The angular distributions of electrons backscattered elastically depend on electron energy and are in good agreement with theoretical calculations (Monte Carlo simulation of primary electrons trajectories in solids) proposed by Jabłoński.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 2; 211-222
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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