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    Wyświetlanie 1-15 z 15
    Tytuł:
    Triplet States and Triplet Excitons in Chemically Mixed Crystals of Acridine with Anthracene
    Autorzy:
    Morawski, O.
    Prochorow, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933611.pdf
    Data publikacji:
    1995-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.70.Ks
    33.50.Dq
    71.35.+z
    Opis:
    Spectral and temporal characteristics and their temperature dependence for the long-lived (phosphorescence and delayed fluorescence) emission of chemically mixed crystals of acridine II (host) with anthracene (guest) were studied under conditions of various spectral resolutions and different modes of excitation. The energy of 0-0 transitions of exciton band and of trap states have been determined and the nature and energy scheme of the triplet states of crystals have been established. The complex arrangement of host molecules into two different pairs in the crystal structure of acridine II is revealed in the energetic "doublet" structure of the trap states for both, the shallow and the deep traps (of acridine and of anthracene origin, respectively). Migration of triplet excitation energy in these chemically mixed crystals is controlled predominantly by the triplet-triplet annihilation of excitons (either heterogeneous or homogeneous) almost in the whole temperature range. The formation of triplet excimers of acridine was definitely ruled out.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 3; 469-481
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cavity Ring Down Measurement of the (1, 0) B $\text{}^{2}$Σ$\text{}_{u}^{+}$ - X $\text{}^{2}$Σ$\text{}_{g}^{+}$ Absorption Band of the N$\text{}_{2}^{+}$ Cation
    Autorzy:
    Fulara, J.
    Łapiński, L.
    Morawski, O.
    Prochorow, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968912.pdf
    Data publikacji:
    1998-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Lg
    39.30.+w
    Opis:
    The ultraviolet (1, 0) B $\text{}^{2}$Σ$\text{}_{u}^{+}$ - X $\text{}^{2}$Σ$\text{}_{g}^{+}$ transition in the N$\text{}_{2}^{+}$ cation was measured with the absorption cavity ring down technique. The N$\text{}_{2}^{+}$ cations were produced in a stationary DC discharge in nitrogen under reduced ( ≈ 0.5 Tr) pressure. The weak band due to the (4, 0) A $\text{}^{2}$Π$\text{}_{u}$ - X $\text{}^{2}$Σ$\text{}_{g}^{+}$ transition in the red part of the spectrum was also recorded. Several of the observed transitions correspond to absorptions from the vibrationally excited (ν'=1) states of N$\text{}_{2}^{+}$ and to absorptions from the neutral N$\text{}_{2}$ molecules in the triplet state.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 5-6; 723-730
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermally Stimulated Electron Emission from K-Bi-GICs
    Autorzy:
    Chrzanowski, J.
    Klimkiewicz, R.
    Morawski, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968867.pdf
    Data publikacji:
    1998-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Tx
    79.75.+g
    79.20.Kz
    Opis:
    The results of the investigations of thermally stimulated electron emission from graphite submitted to intercalation of K-Bi alloy, in the temperature range of 100-400 K, are presented. Total and partial pressure in the measuring chamber in relation to the temperature of the sample are also reported. The insertion of a K-Bi alloy into the interlayers of graphite considerably changes thermally stimulated electron emission properties. The emission images I(T) depend on the content of intercalate and the emission maxima obtained at temperatures of about 170 and 210 K are conditioned by the desorption of a gas while the total pressure above the different samples is of the same order. The desorption of gases at a temperature over 250 K does not cause any increase in the electron emission.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 3; 531-537
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrostatic Pressure Effect on Oxygen Precipitates in Silicon Single Crystal
    Autorzy:
    Misiuk, A.
    Adamczewska, J.
    Bąk-Misiuk, J.
    Härtwig, J.
    Morawski, A.
    Witczak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1890764.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.70.At
    61.70.-r
    81.40.-z
    Opis:
    The effect of hydrostatic pressure on some properties of Cz-Si with oxygen precipitates is investigated. The observed phenomena are discussed in terms of misfit between the precipitates and Si matrix.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 317-320
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ESR and Electron Spin Echo Studies of Spin-Lattice Relaxation of Hydrazinium Radical in Li(N$\text{}_{2}$H$\text{}_{5}$)O$\text{}_{4}$ Single Crystal
    Autorzy:
    Morawski, P.
    Hoffmann, S. K.
    Hilczer, W.
    Goslar, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964224.pdf
    Data publikacji:
    1997-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.Ed
    76.30.Rn
    Opis:
    A hydrazinium ṄH-NH$\text{}_{3}^{+}$ radical was identified by ESR in γ-irradiated Li(N$\text{}_{2}$H$\text{}_{5}$)SO$\text{}_{4}$ single crystal. Unpaired electron is strongly localized on the nitrogen atom as compared to hydrazinium radicals in other crystals. Angular variations of the multicomponent ESR spectra and computer calculations gave the isotropic hyperfine coupling parameters (in mT): a$\text{}_{N1}$ = 1.93, a$\text{}_{N2}$ = 0.80, a$\text{}_{H1}$ = 2.50, a$\text{}_{H1'}$ = 0.48 (NH$\text{}_{3}$), and a$\text{}_{H2}$ = 1.40 (adjacent molecule). The radiation defects containing unpaired electrons do not influence much the protonic conductivity along the hydrazine molecule chains in the crystal. It confirms a tunelling mechanism of the conductivity activated by NH$\text{}_{2}$-group rotation. Spin-lattice relaxation time T$\text{}_{1}$ varies strongly with temperature in the range from 100 ms (10 K) to 90 μs (170 K) and is governed by spectral diffusion (1/T$\text{}_{1}$ ∝ T$\text{}^{2}$) and a Murphy-type mechanism (1/T$\text{}_{1}$ ∝ cosech(Δ/T)) with Δ = 150 cm$\text{}^{-1}$. A distribution of the spin-relaxation times was observed with temperature independent dispersion parameter β = 0.76.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 6; 1121-1129
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emission of Acridine and its Aggregates Isolated in the Neon Matrix
    Autorzy:
    Prochorow, J.
    Kozankiewicz, B.
    Dongo Gemi, Bango Bango
    Morawski, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992729.pdf
    Data publikacji:
    1998-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.50.+w
    33.50.-j
    Opis:
    The results of experimental studies of fluorescence and phosphorescence of acridine in the low-temperature inert neon matrix, at 7 K, are reported. It is found that the low-temperature inert matrix of neon affects the energy levels of acridine molecules very weakly even as compared with nonpolar (aprotic) and non-reactive solvent (e.g. hexane) and that there are different sites for acridine molecules in the neon matrix. However, the observed fluorescence spectra are strongly dependent on the excitation wavelength and besides the different (monomer) sites other emitting species are also contributing to the observed fluorescence emission of acridine in the neon matrix. Clear-cut evidence of the formation of singlet excimers of acridine in the neon matrix demonstrates itself as a very broad and structureless fluorescence spectrum with a relatively large shift from the origin of monomer (site) fluorescence which is characterized by a very distinct vibrational structure. The phosphorescence emission was observed only for the monomers. The observed differences in the low-energy part of excitation spectra of phosphorescence and fluorescence are discussed in terms of the close-lying excited singlet states of n,π* and π,π* character (mixed by the vibronic coupling) and tentatively interpreted as due to the formation of resonance acridine dimers. Their fluorescence spectrum is slightly shifted toward lower energies from the origin of monomer (site) fluorescence.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 5-6; 749-760
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activated carbons from molasses as CO₂ sorbents
    Autorzy:
    Młodzik, J.
    Sreńscek-Nazzal, J.
    Narkiewicz, U.
    Morawski, A.
    Wróbel, R.
    Michalkiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070546.pdf
    Data publikacji:
    2016-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.U-
    68.43.-h
    Opis:
    Aim of this research is to obtain effective, molasses based activated carbon, which would adsorb big amounts of CO₂. Molasses was mixed with KOH. Weight ratio of dry materials was 1:1 (AC1, AC3) and 1:2 (only AC2). Homogeneous mixture was obtained. Material was left for 3 h at 25°C. Drying lasted for 12 h at 200°C, and the material was grounded. The mixture was pyrolysed at 750°C, under constant flow (18 dm³/min) of nitrogen. The material was grounded again. Then, powder was washed with water, until filtrate was neutral, which took about 5 dm³ of water. AC3 was washed with 1 dm³ of water. After drying, materials were soaked in HCl (0.1 mol/dm³) for 19 h, and washed with water, until filtrate was neutral. CO₂ adsorption was performed under high pressure up to 40 atm, at 40°C. Specific surface area (according to the Brunauer-Emmett-Teller equation) was calculated for AC1, AC2 and AC3 and it is respectively 1985, 1967, and 2026 m²/g, micropore volume - 0.714, 0.707, and 0.728 cm³/g and it was between 75% and 89% of total pore volume. The excess uptake at 40 atm pressure was as follows: AC1 - 14.02 mmol/g, AC2 - 12.75 mmol/g, and AC3 - 15.79 mmol/g.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 3; 402-404
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Purely Electronic and Vibronic Fluorescence Excitation of Single Terrylene Molecules in a Naphthalene Crystal
    Autorzy:
    Banasiewicz, M.
    Dresner, J.
    Morawski, O.
    Wiącek, D.
    Kozankiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814019.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.50.+d
    33.20.Kf
    33.50.Dq
    Opis:
    Fluorescence excitation spectra of spatially resolved single terrylene molecules in a naphthalene crystal were studied at 5 K as a function of exciting laser light intensity. The fully saturated fluorescence detection rate for purely electronic transition (0,0) was found to be about twice smaller than that for the two main vibronic components located 239 and 251 $cm^{-1}$ above. This relation is fulfilled when the triplet population rate $k_{23}$ is much weaker than the depopulation rate $k_{31}$. We propose that the weak fluorescence excitation lines observed at the frequencies of 38, 67, 97, and 145 $cm^{-1}$ correspond to nontotally symmetric low-frequency vibration modes of terrylene.
    Źródło:
    Acta Physica Polonica A; 2007, 112, S; S-85-S-94
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetotransport through Nanoconstriction in Ferromagnetic Semiconductor (Ga,Mn)As
    Autorzy:
    Figielski, T.
    Wosiński, T.
    Pelya, O.
    Sadowski, J.
    Morawski, A.
    Mąkosa, A.
    Dobrowolski, W.
    Jagielski, J.
    Wróbel, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035752.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.-b
    75.60.-d
    73.20.Fz
    Opis:
    We studied narrow (submicron) constrictions in the layers of ferromagnetic semiconductor (Ga,Mn)As. We have demonstrated a contribution of the quantum localization effects to the magnetoresistance of the constricted samples. We have also found a negative contribution of a domain wall trapped in the constriction to the resistance, due presumably to the erasing of the localization effects by the domain wall.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 525-531
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of activated carbon from beet molasses and TiO₂ as the adsorption of CO₂
    Autorzy:
    Glonek, K.
    Sreńscek-Nazzal, J.
    Narkiewicz, U.
    Morawski, A.
    Wróbel, R.
    Michalkiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075525.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.U-
    68.43.-h
    Opis:
    The objective of this work is to produce activated carbon from sugar beet molasses containing TiO₂ for CO₂ adsorption and reduction. Textural properties of activated carbons were obtained based on the adsorption-desorption isotherms of nitrogen at 77 K. The specific surface areas of activated carbons were calculated by the Brunauer-Emmett-Teller method. The volumes of micropores were obtained by density functional theory method. The adsorption isotherms of CO₂ were measured up to the pressure of 1 atm at a temperature of 40°C. The best activated carbon adsorbed 1.9 mmol/g of CO₂.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1; 158-161
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Pressure Microwave Study of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$-Pb(Sc$\text{}_{0.5}$Ta$\text{}_{0.5}$)O$\text{}_{3}$ Composite
    Autorzy:
    Czyżak, B.
    Stankowski, J.
    Hilczer, B.
    Krupski, M.
    Morawski, P.
    Andrzejewski, B.
    Marfaing, J.
    Régnier, S.
    Caranoni, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964222.pdf
    Data publikacji:
    1997-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.80.-e
    Opis:
    The ferroelectric relaxor Pb(Sc$\text{}_{0.5}$Ta$\text{}_{0.5}$)O$\text{}_{3}$-superconductor YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ 50% in weight composite exhibits the onset critical temperature T$\text{}_{c}$=95 K. High pressure studies yield the factor dT$\text{}_{c}$/dp of 1.0 K/GPa, close to the value observed for a pure YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ compound. The microwave absorption studies show the significant role of the intergrain weak links.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 6; 1103-1109
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of commercial activated carbons for CO₂ adsorption
    Autorzy:
    Sreńscek-Nazzal, J.
    Narkiewicz, U.
    Morawski, A.
    Wróbel,A. Gęsikiewicz-Puchalska, R.
    Michalkiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070602.pdf
    Data publikacji:
    2016-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.U-
    68.43.-h
    Opis:
    The aim of the investigations was a modification of DTO, a commercial activated carbon (AC), to improve CO₂ adsorption capacity. The adsorption of CO₂ up to 40 bar at 40°C temperature was investigated. The volumetric method was applied for CO₂ adsorption isotherm measurements. The starting material - DTO - was modified using chemical activation (KOH, ZnCl₂, K₂CO₃). The textural parameters of all the ACs were determined by nitrogen adsorption at the liquid nitrogen temperature of -196°C on Quadrasorb SI. Results showed that the AC modified with KOH had the highest S_{BET}, V_{tot}, V_{mic} values of 2063 m²/g, 1.13 cm³/g, and 0.67 cm³/g, respectively. ACs with a wider pore size distribution (from micropores to mesopores) were obtained. The maximum CO₂ adsorption was equal to 14.44 mmol/g for DTO/KOH - modified carbon whereas 8.07 mmol/g of CO₂ was adsorbed at DTO. The CO₂ adsorption capacities of the ACs were found to be closely correlated with the BET surface areas of the materials tested. The experimental data was fitted to the Freundlich, Langmuir, Sips and Toth equations to determine the model isotherm. The Sips model was found to be the best for fitting the adsorption of CO₂.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 3; 394-401
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconducting and Microstructural Properties of (Mg+2B)+MgB$\text{}_{2}$/Cu Wires Obtained by High Gas Pressure Technology
    Autorzy:
    Kario, A.
    Morawski, A.
    Głowacki, B. A.
    Łada, T.
    Smaga, M.
    Diduszko, R.
    Kolesnikov, D.
    Zaleski, A. J.
    Kondrat, A.
    Gajda, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047331.pdf
    Data publikacji:
    2007-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.71.Mn
    Opis:
    In order to improve the overall critical current characteristics of Cu sheathed in situ MgB$\text{}_{2}$ wires a special architecture of the wire, and processing parameters were used. The study presents the influence of the ex situ MgB$\text{}_{2}$ chemical barrier between ex situ core and Cu, suppressing the reaction of Cu with Mg. Wires, doped with 10 at.% SiC of 18 nm average grain size, were fabricated from MgH$\text{}_{2}$ and B or from Mg and B powders, using the powder-in-tube method. The methods of rotary swaging or drawing were used as the alternating wire-forming processes. The samples were annealed under high Ar gas pressure (hot isostatic pressing) at 750ºC and 1.0 GPa for 15 and 30 min. A significant difference in Cu distribution across the wires for a long and short time of sintering was observed. The formation of microstructure in the powder-in-tube process and the relationship between the microstructure and critical current density J$\text{}_{c}$ values, are discussed in this paper.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 5; 693-703
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Electrical Characterization of PbS-EuS Ferromagnetic Semiconductor Microstructures
    Autorzy:
    Wrotek, S.
    Morawski, A.
    Tkaczyk, Z.
    Mąkosa, A.
    Wosiński, T.
    Dybko, K.
    Łusakowska, E.
    Story, T.
    Sipatov, A. Yu.
    Pécz, B.
    Grasza, K.
    Szczerbakow, A.
    Wróbel, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038135.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.Le
    75.30.Et
    75.70.Cn
    Opis:
    Current-voltage characteristics and temperature dependence of differential conductance were studied in lithographically patterned (lateral dimensions from 10 x 10 μm$\text{}^{2}$ to 100 x 100 μm$\text{}^{2}$) ferromagnetic EuS-PbS-EuS microstructures. Below the ferromagnetic transition temperature a 4% decrease in the structure conductance was observed for mutual antiferromagnetic orientation of magnetization vectors of ferromagnetic EuS layers.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 615-620
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vertical Electron Transport through PbS-EuS Structures
    Autorzy:
    Wrotek, S.
    Dybko, K.
    Morawski, A.
    Mąkosa, A.
    Wosiński, T.
    Figielski, T.
    Tkaczyk, Z.
    Łusakowska, E.
    Story, T.
    Sipatov, A. Yu.
    Szczerbakow, A.
    Grasza, K.
    Wróbel, J.
    Palosz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036032.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Ck
    75.30.Et
    Opis:
    Temperature dependence of current-voltage I-V characteristics and resistivity is studied in ferromagnetic PbS-EuS semiconductor tunnel structures grown on n-PbS (100) substrates. For the structures with a single (2-4 nm thick) ferromagnetic EuS electron barrier we observe strongly non-linear I-V characteristics with an effective tunneling barrier height of 0.3-0.7 eV. The experimentally observed non-monotonic temperature dependence of the (normal to the plane of the structure) electrical resistance of these structures is discussed in terms of the electron tunneling mechanism taking into account the temperature dependent shift of the band offsets at the EuS-PbS heterointerface as well as the exchange splitting of the electronic states at the bottom of the conduction band of EuS.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 629-635
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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