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Wyświetlanie 1-15 z 26
Tytuł:
Electronic Spectra of Salicylamide in Polycrystalline Form and Solid Environment
Autorzy:
Kakaš, M.
Janić, I.
Gúth, I.
Powiązania:
https://bibliotekanauki.pl/articles/1994577.pdf
Data publikacji:
1999-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.Dq
Opis:
The fluorescence emission of crystalline salicylamide (λ$\text{}_{max}$ = 426 nm, Stokes shift 6500 cm$\text{}^{-1}$) is attributed to the proton-transferred species. We suppose that the peak at 359 nm in the substructure of fluorescence excitation spectrum at 77 K is in fact the position of the 0-0 transition. The luminescence and excitation spectra of protolytic forms (anion, neutral molecule and cation) of salicylamide in solid solutions were also examined, as well as the equilibria and photoprocesses in the excited state.
Źródło:
Acta Physica Polonica A; 1999, 95, 2; 199-205
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From Jabłoński To Femtoseconds. Evolution of Molecular Photophysics
Autorzy:
Kasha, M.
Powiązania:
https://bibliotekanauki.pl/articles/1993427.pdf
Data publikacji:
1999-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.-j
33.50.Dq
Opis:
A presentation is given, with retrospective commentary, on the experimental and theoretical contributions to key steps in the evolution of the framework of contemporary molecular photophysics from the Jablonski Diagram to femtosecond range excitation phenomena. The distinctive features of polyatomic molecules separating their behavior from atomic and diatomic molecules are emphasized. Justification is given for the statement that spin-orbital coupling with its relativistic component commonly dominates the molecular excitation dynamics of light-(low-Z)-atom molecules. The paper deals with single-photon, single-molecule excitations. Some examples of single-photon, multi-molecule and multi-photon, single-molecule excitation phenomena are listed. A selection of these is made to illustrate the prevalence of femtosecond excitation modes.
Źródło:
Acta Physica Polonica A; 1999, 95, 1; 15-36
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inductive-Resonant Theory of Nonradiative Transitions for Complex Organic Molecules in Condensed Phase
Autorzy:
Ermolaev, V. L.
Sveshnikova, E. B.
Powiązania:
https://bibliotekanauki.pl/articles/1995259.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.Dq
78.30.Jw
Opis:
Ours and literature data on influence of replacement of deuterium by protium in complex organic molecules on nonradiative triplet-singlet transition rates are discussed from the standpoint of the inductive-resonant theory of this process. It has been shown that the extent to which the protium introduction in molecule affects the nonradiative rate depends on distance between protium atom and the vibronic molecular oscillator of triplet-singlet transition and on π -electronic density near-by protium.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 299-308
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluorescence Properties of An Electron Acceptor Substituted Bis-Pyrazolo-Pyridine Derivative: NO$\text{}_{2}$-DMPP
Autorzy:
Rechthaler, K.
Schamschule, R.
Parusel, A. B. J.
Rotkiewicz, K.
Piorun, D.
Köhler, G.
Powiązania:
https://bibliotekanauki.pl/articles/1995490.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.Dq
34.70.+e
Opis:
The fluorescence properties of 3,5-dimethyl-1,7-diphenyl-4 -(4'-nitro-phenyl)-bis-pyrazolo-[3,4-b;4',3'-e]-pyridine (NO$\text{}_{2}$-DMPP) and its parent compound 3,5-dimethyl-1,7-diphenyl-bis-pyrazolo-[3,4-b;4',3'-e]-pyridine (BPP, without the nitrophenyl substituent) were investigated. BPP is a highly fluorescent blue emitter and the fluorescence properties, the emission wavelength, and the fluorescence quantum yield, depend only slightly on solvent. On the contrary, acceptor substituted NO$\text{}_{2}$-DMPP shows dual fluorescence: A long-wavelength component experiences a red-shift with increasing solvent polarity but is efficiently quenched when the polarity exceeds that of solvents like 1,2-dichloroethane or 1-bromopropane. A weak short-wavelength component changes only slightly its position and intensity upon variation of the solvent but its yield increases strongly at low temperatures. The experimental results are discussed in the context of the results of semiempirical calculations which show that fluorescence originates from two closely lying fluorescent states which change their sequence and properties when the polarity of the solvent is varied. A twisted intramolecular charge transfer (TICT) state does most likely not contribute to the emission properties, because of its high energy.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 321-334
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terrylene in a 2,3-Dichloronaphthalene Crystal. New System for Optical Single-Molecule Investigations
Autorzy:
Białkowska, M.
Chaładaj, W.
Makarewicz, A.
Kozankiewicz, B.
Powiązania:
https://bibliotekanauki.pl/articles/1401920.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.Dq
82.37.-j
Opis:
Results of optical studies of a new single-molecule system, terrylene molecules in a 2,3-dichloronaphthalene crystal, are presented for the first time. Analysis of the second-order fluorescence intensity correlation function shows that the external heavy-atom effect (due to the chlorine atoms) contributes to the increase of the intersystem crossing rate constant for the S₁ → T₁ transition, by one order of magnitude, whereas the rate constant for the T₁ → S₀ transition is only weakly influenced.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; RK.128.3.1-1-RK.128.3.1-4
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:
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:
Relaxation of Excited Eu(III) Complexes in Cetyltrimethylammonium Bromide Micellar Solutions
Autorzy:
Sennoga, C. A.
Flint, C. D.
Powiązania:
https://bibliotekanauki.pl/articles/1945625.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.Dq
82.20.Rp
Opis:
The equilibria between pyridine-2,6-dicarboxylate and Eu(III) in H$\text{}_{2}$O or D$\text{}_{2}$O cetyltrimethylammonium bromide micellar solutions at room temperature have been made as a function of the ligand concentration and pH by excitation spectroscopy and emission decay measurements. Formation of the tris-complex is complete at [Eu$\text{}^{3+}$]:[pdc$\text{}^{2-}$] ≥ 1:4 at neutral to slightly alkaline conditions but is incomplete under acidic conditions. The $\text{}^{5}$D$\text{}_{0}$ lifetimes corresponding to the Eu(pdc)$\text{}_{3}^{3-}$ anion is observed to increase on association of the complex with the micellar surface due to exclusion of the solvating molecules from the second co-ordination sphere. Energy transfer in the bulk solution requires the presence of binuclear mixed Eu$\text{}^{3+}$ and Nd(pdc)$\text{}_{3}^{3-}$ complexes or confinement of the Ln(pdc)$\text{}_{3}^{3-}$/Eu$\text{}^{3+}$ on the micelle surface. Energy transfer from the Eu(pdc)$\text{}_{3}^{3-}$ anion is inefficient in the bulk solution.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 327-332
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron-Phonon Coupling in Rare Earth Compounds
Autorzy:
Meijerink, A.
Blasse, G.
Sytsma, J.
de Mello Donega, C.
Ellens, A.
Powiązania:
https://bibliotekanauki.pl/articles/1945477.pdf
Data publikacji:
1996-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.70.Jg
33.50.Dq
33.50.Hv
Opis:
The variation in electron-phonon coupling strength for rare earth ions has been studied by measuring vibronic transition probabilities and temperature dependent line broadening for a large number of rare earth ions in different host lattices. The results show a large variation in the electron-phonon coupling strength (almost three orders of magnitude) and a remarkable trend: the coupling is strong for ions in the beginning and at the end of the lanthanide series and weak in the middle. In covalent host lattices the coupling is much stronger than in ionic host lattices. An explanation of the results is given and the consequences of the variation of the electron-phonon coupling strength on phenomena like multiphonon relaxation, energy transfer and cooperative luminescence are discussed.
Źródło:
Acta Physica Polonica A; 1996, 90, 1; 109-119
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Solute-Solvent Interactions on Radiationless Decay of Thioketones Excited to Their S$\text{}_{2}$- and T$\text{}_{1}$-States
Autorzy:
Szymański, M.
Balicki, M.
Binkowski, M.
Kubicki, J.
Maciejewski, A.
Pawłowska, E.
Wróżowa, T.
Powiązania:
https://bibliotekanauki.pl/articles/1945389.pdf
Data publikacji:
1996-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.Dq
33.50.Hv
35.80.Be
Opis:
Spectral and photophysical properties of a few aromatic thioketones in their S$\text{}_{2}$- and T$\text{}_{1}$-states, in particular those determined by their interactions with solvents, are discussed. The reasons for a drastically different behaviour of thioketones in interactions with benzene as well as saturated hydrocarbons and perfluoroalkanes are analysed in more detail. Results of the time-resolved transient absorption measurements in the pico- and nanosecond time scale are given. An analysis of these results proves that a product of the decay of the S$\text{}_{2}$-state of xanthione in benzene is a new transient (τ $\text{}_{1}\text{}_{/}\text{}_{e}$ ≥ 60 ps) individuum which, regarding the system properties and the conditions of the experiment, has been identified as an exciplex in S$\text{}_{2}$-state formed as a result of an efficient interaction with benzene molecule. Also in xanthione//alkane systems the involvement of a transient individuum was proved. Most probably, this individuum was a thioketyl radical which could be formed by hydrogen abstraction from a hydrocarbon molecule by xanthione in the S$\text{}_{2}$-state. Such individua act as intermediates in passing excitation to the triplet states of thioketones and are effective channels of the S$\text{}_{2}$-state decay. The changes observed in the transient absorption spectra of xanthione in C$\text{}_{6}$H$\text{}_{6}$ in the time range of 10$\text{}^{-7}$-10$\text{}^{-6}$ s can be attributed to the formation of an excimer in the T$\text{}_{1}$-state as a result of the T$\text{}_{1}$-state selfquenching.
Źródło:
Acta Physica Polonica A; 1996, 89, 4; 527-546
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:
Temperature Dependence of Luminescence Decay from the $\text{}^{4}$G $\text{}_{5}\text{}_{/}\text{}_{2}$ State of Sm$\text{}^{3+}$ in Cs$\text{}_{2}$NaSm$\text{}_{x}$Y$\text{}_{1-x}$Cl$\text{}_{6}$ and Cs$\text{}_{2}$NaSm$\text{}_{x}$Eu$\text{}_{y}$Y$\text{}_{1-x-y}$Cl$\text{}_{6}$
Autorzy:
Luxbacher, T.
Fritzer, H. P.
Flint, C. D.
Powiązania:
https://bibliotekanauki.pl/articles/1945619.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.Dq
33.50.Hv
78.55.Hx
Opis:
Luminescence decay curves for the $\text{}^{4}$G $\text{}_{5}\text{}_{/}\text{}_{2}$ → $\text{}^{6}$H $\text{}_{7}\text{}_{/}\text{}_{2}$ emission of Sm$\text{}^{3+}$ in the cubic hexachloroelpasolite crystals Cs$\text{}_{2}$NaSm$\text{}_{x}$Y$\text{}_{1-x}$Cl$\text{}_{6}$ (x=0.005 to x=1) and Cs$\text{}_{2}$NaSm$\text{}_{x}$Eu$\text{}_{y}$Y$\text{}_{1-x-y}$Cl$\text{}_{6}$ (x=0.01 to x=0.95, y=0.05 to y =0.99) have been measured over the temperature range 10 K to 300 K using pulsed laser excitation into the $\text{}^{4}$G $\text{}_{5}\text{}_{/}\text{}_{2}$ state of Sm$\text{}^{3+}$. The luminescence from this state is strongly quenched by cross relaxation to Sm$\text{}^{3+}$ acceptors and energy transfer to the $\text{}^{5}$D$\text{}_{0}$ state of Eu$\text{}^{3+}$. The temperature dependence of cross relaxation and of energy transfer is discussed in terms of the involved mechanisms.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 307-313
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopy and Photophysics of Monoazaphenanthrenes I. Absorption and Fluorescence Spectra of Phenanthridine and 7,8-Benzoquinoline
Autorzy:
Norek, M.
Dresner, J.
Prochorow, J.
Powiązania:
https://bibliotekanauki.pl/articles/2036981.pdf
Data publikacji:
2003-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Lg
33.50.Dq
33.70.-w
Opis:
The absorption and fluorescence spectra of phenaentridine and 7,8-benzoquinoline have been measured in liquid solutions of non-polar, aprotic hydrocarbon solvents (n-hexane and cyclohexane) and in strongly polar (and hydrogen-bonding) methanol. The analysis of the Stokes' shift between absorption and fluorescence spectra has shown that for both molecules the observed solvent effects on their absorption and fluorescence spectra can be described in terms of universal solvent-solute interactions (no evidence of specific solvent-solute interactions, of the type of hydrogen bond formation with participation of lone-pair electrons of nitrogen atom, has been found). On the other hand, the measured decay time profiles of fluorescence are visibly longer in methanol solution than in non-polar, aprotic solvents and these observations are consistent with the observed increase in fluorescence intensity of both molecules in strongly polar methanol solution. The radiative lifetimes of the first excited singlet state do not differ noticeably for both molecules, but it has turned out that in the case of phenanthridine the nonradiative processes are getting less effective in methanol solution than in the case of 7,8-benzoquinoline, which can presumably be related to the role of different position of the substitution of nitrogen atom in these two molecules.
Źródło:
Acta Physica Polonica A; 2003, 104, 5; 425-439
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Beet Root Extract Fluorescence Using TR-LIF Technique
Autorzy:
Rabasovic, M.
Sevic, D.
Terzic, M.
Savic-Sevic, S.
Muric, B.
Pantelic, D.
Marinkovic, B.
Powiązania:
https://bibliotekanauki.pl/articles/1791241.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.62.Be
32.50.+d
33.50.Dq
Opis:
Laser induced fluorescence is a powerful spectroscopic technique commonly used to study the structure and internal state distributions in molecules of biological interest. Betanin $(C_{24}H_{26}N_{2}O_{13})$ is a specific violet betacyanin and the most prominent pigment in the red beet root where it contributes to 75-95% of the total visible color. Our method of excitation of the beet root extract is based on the tunable (320 nm to 475 nm) Nd:YAG laser system. Fluorescence images of beet root extract excited at 320, 340, 360 and 400 nm were obtained. The fluorescence is observed in range from 580 nm to 660 nm. The influence of the solution concentrations on the fluorescence intensity is also analyzed.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 570-572
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescent Macrocyclic Lanthanide Complexes Bearing N-Oxides: Potential Fluorescent Labels for Modern Medical Diagnostics
Autorzy:
Pietraszkiewicz, M.
Karpiuk, J.
Gąsiorowski, R.
Pietraszkiewicz, O.
Rout, Ashok Kumar
Powiązania:
https://bibliotekanauki.pl/articles/1945551.pdf
Data publikacji:
1996-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.Dq
78.55.Kz
82.50.Fv
Opis:
Macrocyclic and macropolycyclic ligands incorporating heteroaromatic N-oxides (3,3'-biisoquinoline-2,2'-dioxide) form strongly luminescent complexes with lanthanide ions: Eu(III) and Tb(III). Most of these complexes are stable water solutions, with excellent luminescent properties, regarding luminescence lifetimes in the range of 0.2-0.7 ms, and the quantum yields for emission up to 0.25. Several complexes are stable also in the presence of affecting ions, such as Ca(II), or phosphates. These features make them attractive as potential fluorescent labels for time-resolved fluoroimmunoassays.
Źródło:
Acta Physica Polonica A; 1996, 90, 1; 207-213
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

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