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Wyszukujesz frazę "25.40.Lw" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Ion and Electron Beam Induced Luminescence οf Rare Earth Doped YAG Crystals
Autorzy:
Gawlik, G.
Sarnecki, J.
Jóźwik, I.
Jagielski, J.
Pawłowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1504113.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Hk
52.59.Bi
79.20.Rf
61.80.Lj
41.75.Ak
41.75.Cn
61.72.S-
61.72.-y
29.40.-n
77.84.Bw
79.60.Ht
87.53.Bn
78.55.-m
78.60.-b
77.55.Px
77.55.-g
25.40.Lw
Opis:
The aim of this work was the evaluation of ion-beam induced luminescence for the characterization of luminescent oxide materials containing rare earth elements. The yttrium aluminium garnet epilayers doped with Nd, Pr, Ho, and Tm atoms were used. The ion-beam induced luminescence spectra were excited using 100 keV $H_2^{+}$ ion beam and were recorded in the wavelengths ranging from 300 nm up to 1000 nm. The separate parts of the surface of the same samples were used for ion-beam induced luminescence and cathodoluminescence experiments. Cathodoluminescence spectra have been recorded in the range from 370 nm up to 850 nm at 20 keV e-beam in scanning electron microscope equipped with a grating spectrometer coupled with a photomultiplier. The observed narrow ion-beam induced luminescence lines can be ascribed to the well known radiative transitions in the rare-earth ions in the YAG crystals. The cathodoluminescence spectra reveal essentially the same emission lines as ion-beam induced luminescence. The decrease of the ion-beam induced luminescence lines intensity has been observed under the increasing ion fluences. The ion-beam induced luminescence may be used for characterization of transparent luminescent materials as an alternative method for cathodoluminescence and can be especially useful for observation of ion-beam damage formation in crystals.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 181-183
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Computation of the Electrostatic Sheath Thickness
Autorzy:
Tahraoui, A.
Fouial, N.
Zaham, B.
Powiązania:
https://bibliotekanauki.pl/articles/1031431.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.25.Vy
52.27.Lw
52.40.Kh
Opis:
In this work we have established a one dimensional, stationary and non-magnetized theoretical model that describes the electrostatic sheath formation [M. Moisan, J. Pelletier, Physique des Plasmas Collisionnels, Application aux Décharges Haute Fréquence, EDP Sciences, 2006]. The sheath thickness is assessed. For this, we have assumed that all species are described by fluid equations. Dust grains are considered spherical particles with constant radii. Their charge is modeled by the orbit motion limited model [P.K. Shukla, A.A. Mamun, Introduction to Dusty Plasma Physics, Institute of Physics, Bristol 2001; A. Bouchoule, Dusty Plasmas, Physics, Chemistry and Technological Impacts in Plasma Processing, Wiley, Chichester 1999]. The solution of the obtained set of differential equations is found using the shooting method. The numerical results show that the sheath thickness depends considerably on the solid surface potential, as well as physical parameters, such as particle densities and temperatures, gas pressure, etc. The calculated electrostatic sheath thickness is greater than the thickness predicted by Child-Langmuir law [M.A. Lieberman, A.J. Lichtenberg, Principles of Plasma Discharges and Materials Processing, Wiley, New York 1994].
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1157-1159
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The trap of dust particles with different sizes in electronegative plasma sheaths
Autorzy:
Benlemdjaldi, D.
Tahraoui, A.
Fouial, N.
Chekour, S.
Powiązania:
https://bibliotekanauki.pl/articles/1070456.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.25.Vy
52.27.Lw
52.40.Kh
Opis:
In this work, we have examined the dynamics of dust particles in the electronegative plasma sheath. For this, we have developed a 1D stationary and unmagnetized model. The electrons and the negative ions are considered in thermodynamic equilibrium, while the positive ions and the impurities (dust grains) are described by fluid equations model. The impurities are considered to have spherical forms; moreover their size distribution is given by Gaussian distribution. Several forces acting on the dust particles are taken into account. The numerical results show that the contribution of the neutral drag force is negligible compared to others forces. In addition, the electrostatic force acting on the nm particles is dominant. Also, we found that the suspension of dust grains in electrostatic sheath is only for a small dust radius interval for which the electrostatic force is balanced by the gravity and the ion drag forces.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 11-13
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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