Temat: 33.55.+b - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

Skocz do pozycji: 2.

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

Skocz do pozycji: 3.

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

Skocz do pozycji: 4.

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

Skocz do pozycji: 5.

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

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