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    Wyświetlanie 1-12 z 12
    Tytuł:
    Thermodynamic Study: C-H Bond Activation of Methane with OsO⁺
    Autorzy:
    Aynali, F.
    Altun Ciftcioglu, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401955.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.-w
    31.15.Ew
    Opis:
    Catalysis plays a critical role in the accomplishment of industrially significant chemical transformations, by requiring less energy investment in underlying processes. Computational chemistry has had a pronounced impact on the understanding of the role of catalysts at the atomic and molecular level, contributing to design of more efficient catalysts. In this study, we compute thermochemical properties attending C-H bond activation of methane by $OsO^+$ and enabling subsequent dehydrogenation and dehydration reactions. It is found that the dehydrogenation channel is thermodynamically more favorable. This study should contribute to the understanding of C-H bond activation using homogeneous catalysis of partial oxidation of natural gas (methane) leading to formation of the easily transported liquid fuel methanol.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-167-B-169
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Orientational Behaviour of the Guest-Host Systems in the Smectic A and Nematic Phases
    Autorzy:
    Bauman, D.
    Moryson, H.
    Wolarz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920664.pdf
    Data publikacji:
    1992-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.Gd
    64.70.Ew
    Opis:
    The measurements of the polarized absorption and fluorescence components spectra for the guest-host mixtures have been used to study the long orientational order in the uniaxial phases of the liquid crystal. The temperature dependence of the order parameters, ⟨P$\text{}_{2}$⟩ and ⟨P$\text{}_{4}$⟩, has been investigated and the molecular distribution function has been determined. On the basis of the ⟨P$\text{}_{2}$⟩ and ⟨P$\text{}_{4}$⟩, values some conclusions about the molecular orientation in the smectic A and nematic phases of the liquid crystalline samples have been drawn. It has been also found that the fluorescence spectroscopy is a sensitive method for determination of the phase transition temperatures of the liquid crystal doped with the fluorescent dye.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 4-5; 559-570
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Guest Influence on the Dipolar Association of the Nematic Liquid Crystal Host
    Autorzy:
    Bauman, D.
    Fan, Zhong-Xiao
    Haase, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1891637.pdf
    Data publikacji:
    1991-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.Gd
    61.10.
    64.70.Ew
    Opis:
    X-ray diffraction method has been used to study the molecular organization in 4-n-pentyl-4'-cyano-p-terphenyl doped with guest dye molecules. It has been found that the dye with strong polar end group affects significantly the monomer to dimer ratio in the nematic phase of the liquid crystal studied.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 4; 545-552
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First Order Hyperpolarizabilities, NPA and Fukui Functions of Cyclohexanone by Density Functional Theory Method
    Autorzy:
    Gangadharan, Rubarani
    Sampath Krishnan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398896.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.-v
    78.30.Jw
    31.15.Ew
    Opis:
    The molecular structure of cyclohexanone was calculated by the B3LYP density functional model with 6-311++G(d,p) basis set by Gaussian program. The results from natural bond orbital analysis have been analyzed in terms of the hybridization of atoms and the electronic structure of the title molecule. The formation of hydrogen bond was investigated using natural bond orbital calculation. The electron density based local reactivity descriptors such as Fukui functions were calculated. The dipole moment (μ) and polarizability (α), anisotropy polarizability (Δα) and first order hyperpolarizability ($β_\text{tot}$) of the molecule have been reported. Thermodynamic properties of the title compound were calculated at different temperatures.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 748-752
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Density Functional Theory Studies on Ir Spectra of the Triphenylene Derivatives. A Scaled Quantum Mechanical Force Field Approach
    Autorzy:
    Merkel, K.
    Kocot, A.
    Wrzalik, R.
    Orgasińska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014386.pdf
    Data publikacji:
    2000-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.-v
    31.15.Ew
    78.30.Jw
    Opis:
    Density functional theory, B3-LYP with the 6-31G$\text{}^{*}$ basis set was applied to study the structures and vibrational infrared spectra of triphenylene and the hexasubstituted triphenylene derivatives. The calculated force fields were scaled using the scaled quantum mechanical force field method. The predicted vibrational frequencies were compared with the experimental IR spectra (500-4000cm$\text{}^{-1}$). The spectra were interpreted and vibrational assignments were reported. This study shows that the scaled density functional force field approach enables, through the transferability of scale factors, good interpretation of vibrational spectra of large molecules.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 5; 525-531
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    System of Diagnostics of the High-Power Accelerator during Formation of Pulsed Bremsstrahlung
    Autorzy:
    Chlenov, A.
    Ivaschenko, D.
    Mordasov, N.
    Shiyan, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807902.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.75.Fr
    41.75.Lx
    41.85.Ew
    41.85.Qg
    Opis:
    System of diagnostics of the high-power electron accelerator based on undisturbing methods and measuring tools of electron beam characteristics as well as amplitude-time characteristics of the pulse forming system is presented. The analysis of amplitude-time characteristics reproducibility of the electromagnetic pulse formation system, electron beam spectral characteristics and properties of bremsstrahlung in the position of test specimen under given modes of operation of the accelerator performs using developed software. Possibilities of complex diagnostics of the power accelerator electron beams acceleration regime and accelerator units are illustrated by analysis of the accelerating tube parameters.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1037-1039
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of Free Radical inγ-Irradiated 21-Hydroxyprogesterone (Deoxycorticosterone) Single Crystals. ESR/ENDOR and DFT Studies
    Autorzy:
    Szyczewski, A.
    Pietrzak, J.
    Möbius, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043407.pdf
    Data publikacji:
    2005-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.-v
    76.70.-r
    78.70.-g
    31.15.Ew
    Opis:
    Single crystals of 21-hydroxyprogesterone have been γ-irradiated at 295 K and studied using X-band ESR and ENDOR. The structure of the one type radical has been determined on the basis of an analysis of the angular variation of the spectra. This radical is formed by abstraction of the hydrogen atom from the C(6) carbon, while the unpaired electron is delocalised onto the system O(3), C(3), C(4), C(5), C(6). Hyperfine splitting constants and unpaired electron density distribution have been calculated for the proposed radical structure by using the Gaussian98 set of programs. The results are in very good agreement with the experimental data. The effect of the hydrogen bond and biological activity on the anisotropy of α-hyperfine splitting tensor have also been discussed.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 1; 119-126
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural Bond Orbital (NBO) Population Analysis of 1-Azanapthalene-8-ol
    Autorzy:
    Gangadharan, Rubarani
    Sampath Krishnan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205799.pdf
    Data publikacji:
    2014-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Tp
    31.15.Ae
    31.15.Ar
    31.15.Ew
    Opis:
    The molecular structure of 1-azanapthalene-8-ol was calculated by the B3LYP density functional model with 6-31G(d,p) basis set by Gaussian program. The results from natural bond orbital analysis have been analyzed in terms of the hybridization of atoms and the electronic structure of the title molecule. The stability of the molecule arising from hyper conjugative interactions, charge delocalization has been analyzed using natural bond orbital analysis. The electron density based local reactivity descriptors such as the Fukui functions were calculated. The dipole moment (μ) and polarizability (α), anisotropy polarizability (Δ α) and first order hyperpolarizability $(β_\text{tot})$ of the molecule have been reported.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 1; 18-22
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frequency Domain Optical Coherence Tomography Techniques in Eye Imaging
    Autorzy:
    Wojtkowski, M.
    Kowalczyk, A.
    Targowski, P.
    Gorczyńska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035626.pdf
    Data publikacji:
    2002-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.30.Wb
    42.66.Ew
    42.66.-p
    07.60.-j
    07.60.Ly
    Opis:
    This contribution presents an application of frequency-domain optical tomography to ophthalmology. Essential theoretical foundations of time-domain and frequency-domain optical tomography are presented. Images of sections through the anterior chamber, the corneo-scleral angle and fundus of the eye are reconstructed from the spectral fringes. The morphological information gained by tomograms is important for diagnosing and planning of a treatment of glaucoma.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 6; 739-746
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proton Transfer in Strong Hydrogen Bonds Revealed by Infrared Spectra - Correlations between Structure and Spectra for the BrH : $NH_3$ Complex
    Autorzy:
    Szczepaniak, K.
    Person, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813986.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.30.Rs
    33.20.Ea
    33.70.Fd
    31.15.Ew
    33.20.Tp
    Opis:
    Our scope is to achieve an understanding of the relation between the infrared spectrum and structure of a strong hydrogen-bonded complex, BrH : $NH_3$, and how and why this relationship is affected by the environment surrounding the complex. A series of DFT/B3LYP/6-31G(d,p) calculations was carried out for this system to obtain its structure and spectrum in different dielectric fields characterized by their relative permittivities. Changes in structure and spectrum (both frequencies and intensities) as the relative permittivity changes are explored. Calculations of spectra are made first under the harmonic approximation. In the next step the effect of anharmonicity was estimated for several different dielectric fields. The calculated anharmonic spectrum (for $ε_r$ = 1.6) is compared with the experimentally observed infrared spectrum of the complex isolated in an Ar matrix at 10 K, obtained in our laboratory. The calculated frequencies and relative intensities for all normal modes agree with the corresponding experimental data surprisingly well. The potential usefulness of structure-spectra correlations is explored.
    Źródło:
    Acta Physica Polonica A; 2007, 112, S; S-19-S-38
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Local Environment on the Electronic Structure and Magnetic Properties of Ni$\text{}_{1-x}$Cu$\text{}_{x}$MnSb Alloys
    Autorzy:
    Jezierski, A.
    Szytuła, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013241.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.Ar
    31.15.Ew
    71.15.Mb
    71.15.-m
    71.15.La
    71.20.-b
    71.20.Be
    Opis:
    The magnetic ordering in Ni$\text{}_{1-x}$Cu$\text{}_{x}$MnSb alloys changes from ferromagnetic (x=0) to antiferromagnetic (x=1). The X-ray and neutron diffraction showed that the systems crystallise in C1$\text{}_{b}$ type structure. We present an influence of the local chemical ordering on the electronic and magnetic properties of Ni$\text{}_{1-x}$Cu$\text{}_{x}$MnSb alloys. The band structure and the magnetic moments were calculated by the spin-polarised linear muffin-tin orbital in the atomic sphere approximation method for the experimental values of the lattice parameters. The magnetic moment of Mn increases from 3.8 μ$\text{}_{B}$ for x=0 to 4.18 μ$\text{}_{B}$ for x=1.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 607-610
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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