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Wyświetlanie 1-15 z 19
Tytuł:
Vibrational Corrections to Transition Properties
Autorzy:
Pluta, T.
Sadlej, A. J.
Powiązania:
https://bibliotekanauki.pl/articles/2014250.pdf
Data publikacji:
2000-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Fb
Opis:
The vibrational contributions to second-order transition properties are considered in the framework of the Born-Oppenheimer approximation. It is shown that the usual formula for vibrational second-order transition matrix elements is incomplete and needs to be supplemented by a term of purely vibrational origin. This pure vibrational contribution is calculated for vibrational transition polarizabilities in LiH and BeF and found to be quite significant. Its inclusion in theoretically calculated data for the Raman intensities appears to be necessary.
Źródło:
Acta Physica Polonica A; 2000, 98, 4; 363-371
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Dynamics of Benzene Molecules in Liquid Carbon Tetrachloride Solution
Autorzy:
Lewandowska, D.
Trumpakaj, Z.
Śliwiński, A.
Grzywacz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1887914.pdf
Data publikacji:
1991-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
51.20.+d
33.20.Fb
35.20.Yh
Opis:
Results of the investigations of C$\text{}_{6}$H$\text{}_{6}$ and CCl$\text{}_{4}$ binary solutions by two methods: dispersion of light and viscometry, as functions of the concentration and temperature are reported.
Źródło:
Acta Physica Polonica A; 1991, 80, 1; 15-21
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ Substrate Crystals by Raman Spectroscopy
Autorzy:
Drozdowski, M.
Kozielski, M.
Pajączkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964243.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.-y
78.30.-j
33.20.Fb
63.20.-e
Opis:
In this paper the study of SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ single crystals using the Raman scattering method is presented. The obtained results are discussed in terms of nature of the crystallografic imperfections and point defects which might arise during the crystal growth process.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 139-142
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectral Investigations of Fullerene-Porphyrin Complexes
Autorzy:
Barszcz, B.
Bogucki, A.
Laskowska, B.
Ion, R.
Graja, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813989.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.-t
33.20.Ea
33.20.Fb
33.20.Kf
33.20.Tp
36.40.-c
31.15.Ar
33.15.Bh
Opis:
Spectral investigations of someμ-oxo-dimer complexes of trivalent metals (Mn, Fe) with two different ligands: tetraphenylporphyrin and tetranaphthylporphyrin (TNP), and fullerene ($C_{60}$ and $C_{70}$) complexes withμ-oxobis[5,10,15,20-tetraarylporphyrinatometal (III)] $(TXP-M)_2O$ dimer, where M = Fe, Mn and X = phenyl or naphthyl, are presented. Discussion of the main electronic and vibrational bands observed in the UV-Vis-IR and Raman spectra of both classes of fullerene-porphyrin systems is given. Experimental data are completed with the quantum chemical calculations of $MnTNP^+$ component.
Źródło:
Acta Physica Polonica A; 2007, 112, S; S-143-S-152
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silver Nanoparticles as Enhancing Substrates for Raman and Fluorescence Spectroscopy
Autorzy:
Cyrankiewicz, M.
Wybranowski, T.
Kruszewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1196708.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Fb
33.20.Kf
32.50.+d
61.46.Df
73.20.Mf
78.67.Bf
87.83.+a
Opis:
The enhancing properties of silver nanoparticles in surface-enhanced Raman scattering (SERS) and metal-enhanced fluorescence (MEF) are studied in this work. The obtained results confirm that the partial aggregation of nanoparticles leads to a great increase of Raman scattering cross-section but there are significant differences in SERS-activity of colloidal silver treated with various aggregating compounds. The differences are interpreted through the analysis of both experimental and computational results. The same silver colloid covered with silica shell preventing the fluorescence quenching makes possible a several-fold increase in fluorescence emission. The effect strongly depends on thickness of the outer layer of nanoparticles. Geometrical parameters of nanoparticles (radius or radius and thickness of the adsorption layer in core-shell systems) are determined on the basis of the dynamic light scattering (DLS) data and extinction spectra analysis.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-11-A-15
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rhodamine 6G as a Mediator of Silver Nanoparticles Aggregation
Autorzy:
Kruszewski, S.
Cyrankiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1400066.pdf
Data publikacji:
2013-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Fb
33.20.Kf
61.46.Df
78.67.Bf
87.83.+a
Opis:
Surface-enhanced Raman scattering is the phenomenon where a huge increase of Raman scattering intensity from molecules situated close to the metal nanoobjects is observed. Our study is focused on the method of SERS-activation of silver nanoparticles and, in the future, the application of thus obtained SERS substrates for biomedical purposes. As expected, the intensity of Raman scattering from rhodamine 6G used here as a SERS probe strongly increase during the early stages of aggregation of silver sol. Moreover, the evolution of extinction spectra and changes in the degree of the colloid aggregation observed in DLS measurements point out that molecules of the dye do not participate passively in the aggregation process but greatly affect its course.
Źródło:
Acta Physica Polonica A; 2013, 123, 6; 965-969
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Franck-Condon Effects in the Absorption Spectrum of C$\text{}_{10}$H$\text{}_{8}$ Anion. the Analysis Based on the AB Initio MCSCF Method
Autorzy:
Andruniow, T.
Pawlikowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1968905.pdf
Data publikacji:
1998-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Fb
Opis:
The near-IR, visible and UV regions of the absorption spectrum of naphthalene anion (C$\text{}_{10}$H$\text{}_{8}^{–}$) are studied in terms of full optimized reaction space multiconfiguration self-consistent field method applied with Dunning's double-zeta basis set including polarization and diffuse functions on the all hydrogen atoms. Computed Franck-Condon activity of the all (nine) totally symmetric vibrations in the seven low-energy transitions is discussed and compared to the available experimental data. The assignment for some electronic transitions in the visible part of the naphthalene anion absorption spectrum is corrected on the base of full optimized reaction space multiconfiguration self-consistent field computations. We have argued that two (overlapping) bands at 21700 cm$\text{}^{-1}$ and 26800 cm$\text{}^{-1}$ are due to 1$\text{}^{2}$B$\text{}_{1g}$ → 1$\text{}^{2}$A$\text{}_{u}$ and 1$\text{}^{2}$B$\text{}_{1g}$ → 2$\text{}^{2}$A$\text{}_{u}$ transitions rather than to the short-axis and long-axis polarized ones as was suggested in an earlier semiempirical treatment. An experimental method appropriate to verify this result is proposed.
Źródło:
Acta Physica Polonica A; 1998, 93, 5-6; 707-715
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:
Laser Raman and Infrared Absorption Spectra of 2,4-dichloronitrobenzene
Autorzy:
Rastogi, V. K.
Jain, D. K.
Mital, H. P.
Sharma, S. N.
Powiązania:
https://bibliotekanauki.pl/articles/1887676.pdf
Data publikacji:
1991-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Ea
33.20.Fb
33.20.Lg
Opis:
The laser Raman and infrared absorption spectra of 2,4-dichloronitrobenzene have been recorded in pure liquid state. The vibrational spectra have been analysed assuming C$\text{}_{s}$, point group for the molecule. The assignments for fundamental vibrations, combination and overtone frequencies and internal modes of vibrations of NO$\text{}_{2}$ group have been proposed.
Źródło:
Acta Physica Polonica A; 1991, 79, 6; 765-774
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Franck-Condon Effects in Resonance Raman Spectra of TCNQ$\text{}^{-}$ and C$\text{}_{10}$H$\text{}_{8}^{+}$ Radicals. A Search for Dushinsky Rotation of Totally Symmetric Modes
Autorzy:
Zborowski, K.
Pawlikowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1933604.pdf
Data publikacji:
1995-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Fb
Opis:
The resonance Raman spectra of tetracyanoquinodimethane anion (TCNQ$\text{}^{-}$) and naphthalene cation (C$\text{}_{10}$H$\text{}_{8}^{+}$) are analyzed in terms of theoretical model based on the Franck-Condon effects. The model includes also the effect of rotation of totally symmetric normal coordinates upon electronic excitation to the resonant state (Dushinsky effects). It is shown that such a simple model accounts correctly for the available resonance Raman spectra for TCNQ$\text{}^{-}$ and C$\text{}_{10}$H$\text{}_{8}^{+}$ radicals. The possible model refinements such as vibronic coupling effects are also briefly discussed.
Źródło:
Acta Physica Polonica A; 1995, 88, 3; 435-444
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and Quantum Chemical Calculations of 2-Amino-4,5,6,7-Tetrahydrobenzo[b]Thiophene-3-Carbonitrile
Autorzy:
Oturak, H.
Kaya Kinaytürk, N.
Topuz, M.
Kutlu, N.
Kaynaker, E.
Talıp, P.
Sert, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1031126.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.E-
33.20.Ea
33.20.Tp
33.20.Fb
33.20.Lg
33.20.Bx
Opis:
Vibrational frequencies of 2-Amino-4,5,6,7-Tetrahydrobenzo[b]Thiophene-3-Carbonitrile were calculated using density functional (DFT/B3YLP) method with 6-311++G(d,p) basis set by Gaussian 09. The assignments of the vibrational frequencies have been done by potential energy distribution analysis, using VEDA 4 software. The density functional theory and time dependent density functional theory methods have been used to study the electronic properties of 2-Amino-4,5,6,7-Tetrahydrobenzo[b]Thiophene-3-Carbonitrile. Isotropic chemical shifts were calculated using the gauge-invariant atomic orbital method. All computed spectroscopic properties were compared with experimental ones. The simulated spectra of the molecule show excellent agreement with the experimental spectra.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1192-1199
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Tomato Juice Quality Using Surface Enhanced Raman Spectroscopy
Autorzy:
Malekfar, R.
Nikbakht, A.
Abbasian, S.
Sadeghi, F.
Mozaffari, M.
Powiązania:
https://bibliotekanauki.pl/articles/1537806.pdf
Data publikacji:
2010-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.-j
33.20.Fb
Opis:
Tomato (Lycopersicon esculentum L.) is a valuable fruit cultivated in the world as an important plant. There are a lot of industries engaged with the drying, processing, quality control and sorting of tomato. A rapid and reliable measurement of qualitative factors of tomato and its products can be a serious necessity for the producers and industrialists. The objective of this research was to implement SERS as a modern technique to evaluate some qualitative parameters of tomato juice. To prevent the effect of cartenoids and florescence background, the juices were centrifuged. Silver colloid was prepared according to Lee and Meisel method for SERS experiments. The results were compared with the spectra obtained from ordinary spontaneous Raman spectroscopy technique data. Three major bands assigned to carbohydrates in tomato were detected and analyzed. Moreover, a medium band related to proteins could be identified. Comparison of SERS spectra with the normal spontaneous Raman spectra proved that SERS has a privilege in the measurement of carbohydrates and proteins as an effective, rapid and precise technique.
Źródło:
Acta Physica Polonica A; 2010, 117, 6; 971-973
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of FITC Fluorescence by Silver Colloids and Silver Island Films
Autorzy:
Kruszewski, S.
Wybranowski, T.
Cyrankiewicz, M.
Ziomkowska, B.
Pawlaczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1812349.pdf
Data publikacji:
2008-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Fb
33.20.Kf
33.50.-j
Opis:
Silver colloids and silver island films as fluorescence enhancement systems are the subject of this paper. Enhancement of fluorescence of molecules placed near metallic nanoparticles is a result of resonance interaction of exciting and emitted lights with surface plasmons. Two models explaining this phenomenon are presented. Processes of silver colloids and silver island films forming are described. Results of extinction, absorption and scattering studies of fluorescence enhancement systems are presented. The influence of these systems, i.e. silver colloids and silver island films on the fluorescence of fluorescein-5-isothiocyanate was studied. 7-fold increase in fluorescence intensity of fluorescein-5-isothiocyanate molecules placed near silver nanoparticles was observed.
Źródło:
Acta Physica Polonica A; 2008, 113, 6; 1599-1608
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastooptic Constants of SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ Single Crystals Determined by Brillouin Scattering
Autorzy:
Drozdowski, M.
Pajączkowska, A.
Kasprowicz, D.
Ziobrowski, P.
Gloubokov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964361.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Fb
78.35.+c
63.20.-e
Opis:
In this paper we report the elastooptic constants p$\text{}_{ij}$ of strontium lanthanum aluminate, SrLaAlO$\text{}_{4}$ and strontium lanthanum gallate SrLaGaO$\text{}_{4}$ single crystals, which were determined at room temperature using Brillouin scattering method. In order to investigate the elastooptic constants of SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ single crystals, a substitution method proposed by Cummins and Schoen, and developed by Nelson and Lax was used. The obtained results are also discussed in terms of the nature defects which might arise in these crystals during growth process.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 177-181
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Depolarization Dispersion of Totally Symmetric Fundamentals in Resonance Raman Spectra. Analysis for Azobenzene Dyes
Autorzy:
Sassi, P.
Pawlikowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1945691.pdf
Data publikacji:
1996-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Fb
Opis:
The resonance Raman excitation profiles and depolarization dispersions for totally symmetric vibrations are studied under the energy region corresponding to an excitation of two low-energy states of 4-nitro-4'-diethylaminoazobenzene dye. In a contrast to the earlier analysis of this dye we assume that the low-energy states of the molecule studied have different polarizations. It results in the depolarization dispersions of the Raman lines of totally symmetric vibrations. The effect is illustrated for two vibrations: ν$\text{}_{4}$=1342 cm$\text{}^{-1}$ and ν$\text{}_{7}$=1448 cm$\text{}^{-1}$ for which excitation profiles show distinctive intensity distribution patterns due to interferences between the vibrational manifolds of the overlapping states. The nature of the electronic (resonant) states and the magnitudes of Franck-Condon parameters determined from the experiment are also briefly discussed.
Źródło:
Acta Physica Polonica A; 1996, 90, 3; 509-518
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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