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Wyszukujesz frazę "31-34" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Theoretical Analysis of the Electronic Ground and Excited Franck-Condon State of 2-Alkylamino-(3, 5, or 6)-Methyl-4-Nitropyridine N-oxides
Autorzy:
Deperasińska, I.
Makarewicz, A.
Szemik-Hojniak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813987.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.Ew
34.50.Gb
34.70.+e
Opis:
We theoretically characterised properties of the electronic ground and excited Franck-Condon state of 2-alkylamino-(3, 5, or 6)-methyl-4- -nitropyridine N-oxides. The obtained results of time-dependent density functional theory calculations are consistent with the experimental absorption spectra. The nature of the lowest excited states of the considered N-oxides molecules is discussed. Two excited singlet states (in the midst of four lowest states) have the charge-transfer character. These states have different charge-transfer contribution of the two electron donor groups to the same electron acceptor. In consequence, different conditions for the promotion of intramolecular proton transfer in excited state are created in each case.
Źródło:
Acta Physica Polonica A; 2007, 112, S; S-71-S-84
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excited States of Intermolecular Electron-Donor-Acceptor Systems and Internal Geometry of Complex Components
Autorzy:
Deperasińska, I.
Sobieraj, A.
Powiązania:
https://bibliotekanauki.pl/articles/1995340.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.Ct
31.70.-f
34.70.+e
Opis:
In this work we present the results of semiempirical AM1 calculations of the energy of electron-donor-acceptor system in the ground and excited states with full optimization of the complex geometry (in terms of both: intermolecular and intramolecular coordinates). A comparison of these results with those obtained for separated acceptor and donor molecules enables the estimation of the energetic effects of changes in internal structure of donor and acceptor which accompany the process of formation and stabilization of excited charge-transfer state. It is shown that energies corresponding to those changes are comparable with the energy of intermolecular interactions between donor and acceptor molecules.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 309-319
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescent Probe for Highly Energetic Collisions in Mixtures of Complex Molecules with Acceptors of Vibrational and Triplet Energy
Autorzy:
Zalesskaya, G. A.
Yakovlev, D. L.
Sambor, E. G.
Baranovsky, D. I.
Powiązania:
https://bibliotekanauki.pl/articles/2008324.pdf
Data publikacji:
1999-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.50.+w
34.50.Ez
34.90.+q
Opis:
Pressure dependences of intensities and decay rates of time-resolved luminescence of acetophenone, benzophenone, anthraquinone were used to obtain the efficiencies of vibrational and triplet-triplet energy transfer. It was shown that vibrational relaxation of the chosen molecules can be interpreted in terms of two consecutive processes: rapid collisional relaxation of molecules from initially prepared states to a vibrational distribution at T$\text{}_{vib}$ by vibration-vibration process and relaxation of this vibrational distribution to the thermal one (vibration-translation process). At relatively small internal energy < 10000 cm$\text{}^{-1}$, the collisional efficiencies of the vibration-vibration process in mixtures with polyatomic bath gases had values typical of processes with a supercollision contribution. Molecules relaxed from the upper vibrational level to the vibrational distribution after several collisions (2-3). The average energies transferred per collision are well correlated with predictions of the simple ergodic theory of collisional energy transfer. The majority of the collisions took part only in vibration-translation energy transfer of relatively small energies. The efficiencies of triplet-triplet energy transfer were analyzed for acetophenone, benzophenone and anthraquinone as donors and biacetyl-acceptor in a gas phase when energy of about 20000 cm$\text{}^{-1}$ was transferred. It permitted us to elucidate the common features of highly energetic collisions. It was shown that the efficiencies are much lower than the gas kinetic ones and depended on the vibrational energy and temperature. It was discussed how to enhance triplet-triplet efficiencies due to vibrational excitation of a donor molecule.
Źródło:
Acta Physica Polonica A; 1999, 95, 6; 897-910
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exchange Contributions to Spin Polarization in Low-Energy Electron Scattering from Xe and Hg
Autorzy:
Sienkiewicz, J. E.
Fritzsche, S.
Syty, P.
Powiązania:
https://bibliotekanauki.pl/articles/2014050.pdf
Data publikacji:
2000-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Bm
31.30.Jv
Opis:
The contribution of exchange interactions is investigated for spin polarization of electrons which are scattered elastically from xenon and mercury at the energy of 1.5 eV. We find that electron exchange between the bound-state and the scattered electron gives rise to a substantial spin polarization in both cases.
Źródło:
Acta Physica Polonica A; 2000, 98, 1-2; 41-46
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shaking during ion-atom collisions
Autorzy:
Sharma, P.
Nandi, T.
Powiązania:
https://bibliotekanauki.pl/articles/1158707.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.xp
34.50.Fa
25.70.Bc
Opis:
The shaking (shakeup and shakeoff) processes accompanying ion-atom collisions are studied using non-relativistic hydrogenic wave functions for the K-, L- and M-shell electrons in the sudden approximation limit. The role of recoil amplitude in the shaking processes is discussed. It is found that the suddenness of collision between projectile and target nuclei plays a more definitive factor in the shaking of the respective atomic system than the recoil of nuclei.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 697-700
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Study of Positronic Atoms with Adiabatic Separation of Positronic Motion
Autorzy:
Strasburger, K.
Wołcyrz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1812552.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.20.Cf
31.50.Bc
36.10.Dr
Opis:
A modified adiabatic approximation, with the positron treated as a light nucleus and its charge included only partially in the electronic Hamiltonian, was applied to compute the energies and properties of bound states of lithium positride, positronic beryllium and positronic magnesium. The electronic Schrödinger equation was solved with the configuration interaction method. No bound state was obtained for lithium positride, while the dissociation energies of positronic beryllium and positronic magnesium were underestimated by 2.6 and 7 millihartrees, respectively. Consequences for the applicability of the adiabatic approximation to describe positronic systems are discussed.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1533-1542
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy Transfer and Up-Conversion in the Erbium Elpasolites Cs$\text{}_{2}$NaEr$\text{}_{x}$Y$\text{}_{1-x}$Cl$\text{}_{6}$
Autorzy:
Campbell, M.
Flint, C. D.
Powiązania:
https://bibliotekanauki.pl/articles/1945497.pdf
Data publikacji:
1996-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
13.40.Hq
31.70.Hq
34.30.+h
61.72.Ss
78.55.Hx
Opis:
The luminescence decay curves from the $\text{}^{4}$F $\text{}_{9}\text{}_{/}\text{}_{2}$ and $\text{}^{4}$I $\text{}_{9}\text{}_{/}\text{}_{2}$ states of the cubic hexachloroelpasolite crystals Cs$\text{}_{2}$NaEr$\text{}_{x}$Y$\text{}_{1-x}$Cl$\text{}_{6}$ (x = 0.001÷1) have been measured over the temperature range 10-300 K. The $\text{}^{4}$I $\text{}_{9}\text{}_{/}\text{}_{2}$ state undergoes an electric dipole vibronic-electric dipole vibronic cross-relaxation process at 300 K, but this mechanism is inefficient below 165 K. Excitation into the $\text{}^{4}$F $\text{}_{9}\text{}_{/}\text{}_{2}$ state, results in emission in the green, blue and ultra violet regions. The up-conversion processes which could account for the ultraviolet emission are discussed.
Źródło:
Acta Physica Polonica A; 1996, 90, 1; 151-160
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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