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    Wyświetlanie 1-9 z 9
    Tytuł:
    Dichroism of Poly(Methyl Methacrylate) Thin Films Doped with Disperse Orange 11 Molecules
    Autorzy:
    Abbas, B.
    Alshikh Khalil, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808005.pdf
    Data publikacji:
    2009-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.55.+b
    78.20.-e
    78.66.Qn
    Opis:
    We investigate the absorption spectra of poly (methyl methacrylate) (PMMA) thin films doped with Disperse Orange 11 (DO11) dye molecules which change under illumination with visible light. Dichroism measurements of the kinetics of the transmission changes at 472 nm at room and low temperatures (-60° C ± 2 °C) have been investigated. Our data show that the photoisomerisation reaction and the light-induced polar orientation depend on the molecular structure of the polymer. Simultaneous UV-visible spectroscopy at low temperature confirms the existence of two forms of DO11 molecules (keto and enol forms), which are responsible for the interaction with irradiating laser light and forming an anisotropic structure inside the PMMA/DO11 thin film.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 5; 857-863
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Dynamic Dichroism Properties of Disperse Orange 11 Molecules and Azo-Molecules Doped in Poly(Methyl Methacrylate) Thin Films: A Comparison
    Autorzy:
    Abbas, B.
    Alshikh Khalil, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537688.pdf
    Data publikacji:
    2010-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.55.+b
    78.20.e
    78.66.Qn
    Opis:
    We investigate the dichroism characteristics of poly (methyl methacrylate) PMMA thin films doped with DO11, DO3, DSR13 and DSR1 dye molecules, which change under illumination with visible light. Our data show that photoisomerisation, phototautomerization reactions and light-induced polar orientation are dependent on the molecular structure of the polymer. Polar structure and molecular size, as well as the chemical structure of PMMA host, are the dominant parameters that determine both the extent and speed of dichroism buildup and relaxation processes. Two forms of DO11 molecules (keto and enol forms), and two other forms of azo-based dyes ( trans and cis forms) are responsible for the interaction with irradiating laser light and forming an anisotropic structure inside the PMMA/dye thin films.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 6; 904-910
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Photo-Induced Dichroism in Sudan III Doped in Poly(Methyl Methacrylate) Thin Films
    Autorzy:
    Abbas, B.
    Salman, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399001.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ek
    33.55.+b
    78.66.Qn
    Opis:
    Linear dichroism, dichroic ratio, contrast ratio and order parameters of Sudan III/PMMA guest-host thin films have been investigated with visible polarized laser light. Dichroism increased in an exponential fashion with increase of the pump intensity. Light-induced dichroism and polar order of the dye molecules within the polymer network were reversible. These parameters showed fast increase in their values in an exponential fashion as the pumping process takes place. Also, they decay rapidly in an exponential fashion when the pump light is cut off. Photoisomerisation and polar orientation are dependent on both the molecular structure of the dye and polymer. Two forms of Sudan III molecules (trans and cis) are responsible for the interaction with laser light and forming an anisotropic structure inside the PMMA/Sudan III films. However, there is another set of forms of the dye (keto and enol) has to be considered, which may contribute to dichroism.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 780-786
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetochiral Effect in H$\text{}_{h}$ and V$\text{}_{h}$ Components of Rayleigh Light Scattering by Diamagnetic Molecular Systems
    Autorzy:
    Woźniak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028894.pdf
    Data publikacji:
    2001-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.15.Kr
    33.20.Fb
    33.55.-b
    78.20.Ls
    Opis:
    A static magnetic field B$\text{}^{0}$, acting on a chiral liquid perpendicular to the propagation direction of an optical beam, is shown to induce a magnetochiral change of Rayleigh light scattering which is different in sign for the light scattered parallel and antiparallel to B$\text{}^{0}$. It is related to the electric dipole and magnetic dipole or/and electric quadrupole moments induced simultaneously in a chiral molecule by electric dipole interaction with electromagnetic radiation. For diamagnetic molecules the effect is described by linear and nonlinear polarizabilities, responsible also for circular birefringence (natural optical activity and the Faraday effect) as well as axial (magnetochiral) birefringence.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 4; 517-528
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light-Induced Tautomerization in Porphyrin Isomers
    Autorzy:
    Waluk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1993612.pdf
    Data publikacji:
    1999-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.-t
    33.50.-j
    78.55.-m
    78.60.-b
    Opis:
    Double proton tautomerization occurring in porphyrin and its structural isomers represents a special case of a chemical transformation in which the substrate and the product are form ally the same. The methods used for the investigation of this kind of processes are based on polarized spectroscopy and high-resolution techniques, such as matrix isolation. Their combined use results in obtaining information pertinent to the mechanism of proton transfer, regarding e.g., the values of proton transfer rates, structure of the tautomeric forms or the shape of the potential energy surfaces. In addition, these procedures provide a way of obtaining spectral, photophysical and structural data that would be otherwise difficult to gain. The examples include determination of transition moment directions, assignment of electronic and vibrational states, elucidation of the character of the substitutional replacement of the rare gas matrix atoms by the chromophore, and the analysis of the nature of the symmetry lowering due to the matrix cage.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 1; 49-62
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopy and Photophysics of Monoazaphenanthrenes III. Luminescence of Phenanthridine and 7,8-benzoquinoline in Crystalline State
    Autorzy:
    Norek, M.
    Kozankiewicz, B.
    Prochorow, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038186.pdf
    Data publikacji:
    2004-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Kz
    33.50.Dq
    Opis:
    Fluorescence and phosphorescence spectra and the decay profiles of both these emissions have been investigated for the polycrystals of phenanthridine and 7,8-benzoquinoline, in the liquid helium (5 K) - room temperature range. These two monoazaderivatives of phenanthrene, which differ only by the position of N-heteroatom in the aromatic ring skeleton of phenanthrene, were found to exhibit very different fluorescence spectra, which also differ greatly in their temperature behavior. Supplementary investigations of the fluorescence of single crystals of 7,8-benzoquinoline have supported classification of observed fluorescence as an excimer fluorescence (caused by the specific arrangement of molecules of 7,8-benzoquinoline in the crystal). In contrary fluorescence of phenanthridine crystals is of the monomeric type. Phosphorescence spectra observed for the crystals of both molecules are very similar, but their temperature dependence is also different. This may be considered as an indication of a different physical mechanism of nonradiative intersystem crossing processes, which are operating between the lowest excited singlet state and the lowest excited triplet state in the crystals of both molecules.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 1; 77-94
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quasi-Molecule Model of the Spectra of Molecules in Polar Solution in Case of Time Dependent Fluorescence Shifts
    Autorzy:
    Bączyński, A.
    Marszałek, T.
    Radomska, D.
    Targowski, P.
    Ziętek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920928.pdf
    Data publikacji:
    1992-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.50.Dq
    78.55.Bq
    Opis:
    Analytical expressions of profiles of absorption and instantaneous fluorescence spectra of dye molecules in polar solvents are given. It is shown what parameters can be gained from electronic spectra of dye solutions. The new procedure of interpretation of transient fluorescence spectra is demonstrated in the case of the spectra of nile blue in alcohol.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 3; 413-420
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ preparatów stosowanych w zwalczaniu choroby motylicznej na gospodarkę witaminami z grupy B oraz na obraz histologiczny i histochemiczny narządów wewnętrznych u szczurów. II. Bilevon 9015 "Bayer"
    Effect of some drugs used inthe control of Fasciola hepatica on the level of certain vitamins from group B and on the histological and histochemical changes in the internal organs of a rat. II. Bilevon 9015-Bayer (2,2'-dihydroxy-3,3'-dinitro-5,5'-dichlor-diphenyl)
    Vlijanie preparatov, primenjaemykh v bor'be s pochenochnojj dvuustkojj na obmen vitaminami iz gruppy B, a takzhe na gistologicheskuju i gistokhimichskuju kartiny vnutrennykh organov u krys. II. Bilevon 9015 "Bajjer" (2,2'-gididroksi-3,3'-dinitro-5,5'-dichlor-difenil)
    Autorzy:
    Roszkowski, J.
    Krauss, S.
    Zalewska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/838951.pdf
    Data publikacji:
    1967
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Opis:
    Effect of maximum tolerant dose of Bilevon 9015-Bayer on the histological and histochemical changes in the internal organs and on the level of the vitamin B₂, B₁₂ and PP in the liver of the rats was studied. It was shown that Bilevon 9015-Bayer caused not only the morphological changes in the duodenum (oedema villi) and in the kidney (extravasations), but also produced the stress reaction that was expressed by the decrease of the glycogen content in the liver and the depletion of lipids in the inner layers of the adrenal cortex. Although the toxic effect was still seen after 72 hours, but it was transient and no changes were found on the 7th day of the experiment. This effect was not probably caused by the properties of the drug, but by the dose used in the experiment. No significant changes in the level of the examined vitamins in the liver could be seen.
    Źródło:
    Annals of Parasitology; 1967, 13, 2-3
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ preparatów stosowanych w zwalczaniu choroby motylicznej na gospodarkę witaminami z grupy B oraz na obraz histologiczny i histochemiczny narządów wewnętrznych u szczurów. II. Bilevon 9015 "Bayer"
    Effect of some drugs used inthe control of Fasciola hepatica on the level of certain vitamins from group B and on the histological and histochemical changes in the internal organs of a rat. II. Bilevon 9015-Bayer (2,2'-dihydroxy-3,3'-dinitro-5,5'-dichlor-diphenyl)
    Vlijanie preparatov, primenjaemykh v bor'be s pochenochnojj dvuustkojj na obmen vitaminami iz gruppy B, a takzhe na gistologicheskuju i gistokhimichskuju kartiny vnutrennykh organov u krys. II. Bilevon 9015 "Bajjer" (2,2'-gididroksi-3,3'-dinitro-5,5'-dichlor-difenil)
    Autorzy:
    Roszkowski, J.
    Krauss, S.
    Zalewska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2177684.pdf
    Data publikacji:
    1967
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Opis:
    Effect of maximum tolerant dose of Bilevon 9015-Bayer on the histological and histochemical changes in the internal organs and on the level of the vitamin B₂, B₁₂ and PP in the liver of the rats was studied. It was shown that Bilevon 9015-Bayer caused not only the morphological changes in the duodenum (oedema villi) and in the kidney (extravasations), but also produced the stress reaction that was expressed by the decrease of the glycogen content in the liver and the depletion of lipids in the inner layers of the adrenal cortex. Although the toxic effect was still seen after 72 hours, but it was transient and no changes were found on the 7th day of the experiment. This effect was not probably caused by the properties of the drug, but by the dose used in the experiment. No significant changes in the level of the examined vitamins in the liver could be seen.
    Źródło:
    Wiadomości Parazytologiczne; 1967, 13, 2-3; 243-250
    0043-5163
    Pojawia się w:
    Wiadomości Parazytologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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