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    Wyświetlanie 1-9 z 9
    Tytuł:
    Pressure Broadening of J=1 ← 0 Rotational Line of Fluoroform Caused by Spherical Perturbers
    Autorzy:
    Gierszal, S.
    Galica, J.
    Miś-Kuźmińska, E.
    Liber, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030715.pdf
    Data publikacji:
    2002-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Bx
    33.20.Sn
    Opis:
    The foreign-gas broadening parameter was measured for CHF$\text{}_{3}$ molecule interacting with spherical (SF$\text{}_{6}$, CF$\text{}_{4}$, CH$\text{}_{4}$, CCl$\text{}_{4}$) perturbers and the pressure shift parameter of rotational transition J=1 ← 0 in the CHF$\text{}_{3}$ molecule was obtained. For the systems of trifluoromethane molecule and four spherical molecules as perturbers the collision cross-sections were determined. Experimental line width parameters are interpreted using Anderson-Tsao-Curnutte as well as Murphy-Boggs theories. Accounting for the dispersive and inductive interactions the cross-section was determined. The theoretical values are in qualitative agreement with the experimental results, but the absolute values of the measured cross-section were larger than these calculated.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 6; 805-813
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lineshape Measurements of Rotational Line in Millimeter-Wave Region by Second Harmonic Detection
    Autorzy:
    Stanek, J.
    Gierszal, S.
    Galica, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929813.pdf
    Data publikacji:
    1993-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Bx
    33.70.Jg
    Opis:
    Lineshape measurements of the J = 6 ← 5 OCS rotational transition were performed using a source-modulation microwave spectrometer. This is a very useful experimental technique but it introduces distortions to the line profile, therefore several authors have theoretically analyzed this problem with the aim of extracting the undistorted parameters of the spectra. The objective of this paper is to verify one of these theories which gives the relationship between harmonic signals and lineshape over wide range of modulation depth. Detailed comparison between the calculated and experimental harmonic signals shows very good agreement, and thus enables us to determine the unmodified line width and finally the pressure broadening factor of the rotational transition J = 6 ← 5 of OCS molecule to be equal to 6.59 ± 0.25 MHz/Tr.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 6; 1027-1034
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependence of Pressure Broadened Linewidth of J = 1 ⇐ 0 Rotational Transition of CH$\text{}_{3}$C$\text{}_{14}$N Molecule Mixed with OCS and H$\text{}_{2}$ Molecule
    Autorzy:
    Gierszal, S.
    Galica, J.
    Miś-Kuźmińska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932112.pdf
    Data publikacji:
    1995-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Bx
    33.70.Jg
    Opis:
    The temperature dependence of the pressure-broadening parameters of the J = 1 ⇐ 0 rotational transition of OCS and H$\text{}_{2}$ in the ground vibrational state of CH$\text{}_{3}$C$\text{}_{14}$N molecule is measured in the temperature range between 248 and 293 K. The line shape of the absorption is recorded with a Stark modulated microwave spectrometer. Using least squares fits of the data to the Voigt line function, several contributions to the linewidth have been deduced. The experimental results are compared with the calculated results using Murphy and Boggs collision broadening theory. The pressure-broadening parameters C$\text{}_{W}$(x) of the gas mixture CH$\text{}_{3}$CN+OCS and CH$\text{}_{3}$CN+H$\text{}_{2}$ are 14.05±0.30 MHz/Tr, 9.15±0.12 MHz/Tr, respectively and the temperature dependence parameters α are -0.90 ± 0.07 and -0.77 ± 0.08.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 3; 585-597
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nuclear Quadrupole Coupling Tensor of Ch$\text{}_{2}$Cl$\text{}_{2}$: Comparison of Quadrupolar and Structural Angles in Methylene Halides
    Autorzy:
    Kisiel, Z.
    Kosarzewski, J.
    Pszczółkowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1967844.pdf
    Data publikacji:
    1997-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.15.Dj
    33.15.Pw
    33.20.Bx
    Opis:
    Nuclear quadrupole hyperfine structure in 2$\text{}_{1,2}$ ← 3$\text{}_{0,3}$ and 1$\text{}_{1,1}$ ← 2$\text{}_{0,2}$ rotational transitions of CH$\text{}_{2}^{35}$Cl$\text{}_{2}$ at 9.2 and 15.9 GHz, respectively, was measured with a newly constructed pulsed supersonic beam, cavity Fourier transform microwave spectrometer. All components of nuclear quadrupole splitting tensors of the chlorine nuclei in inertial and in principal quadrupole axes were determined. It is shown that in methylene halide molecules nuclear quadrupole information leads to a value for ∠(XCX) which is systematically larger than ∠(XCX) defined by the positions of the nuclei. Some novel features of the spectrometer are also described.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 3; 507-516
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observation and Properties of the van der Waals Dimer Ar···HCCCN Produced in Electrical Discharge
    Autorzy:
    Desyatnyk, O.
    Kosarzewski, J.
    Kisiel, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036980.pdf
    Data publikacji:
    2003-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.15.Dj
    33.15.Mt
    33.15.Pw
    33.20.Bx
    36.40.Mr
    Opis:
    The weakly bound van der Waals dimer between a molecule of cyanoacetylene and an argon atom was observed by rotational spectroscopy of supersonic expansion. Cyanoacetylene was generated in situ from vinyl cyanide precursor by means of a high voltage discharge just downstream of the expansion nozzle. Both $\text{}^{b}$R- and $\text{}^{b}$Q-type rotational transitions were measured and rotational, centrifugal distortion, and nuclear quadrupole splitting constants were determined. Analysis of the data shows that ground state geometry of the dimer is characterised by R$\text{}_{cm}$=3.65Å andθ=94.9º, with the Ar atom shifted from the position above the cyanoacetylene centre of mass in the direction of the CN group.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 5; 415-424
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rotational Spectrum of the Most Abundant Isotopomers of the Van der Waals Dimer N$\text{}_{2}$···HBr
    Autorzy:
    Kisiel, Z.
    Pietrewicz, B. A.
    Pszczółkowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030327.pdf
    Data publikacji:
    2002-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.15.Dj
    33.15.Mt
    33.15.Pw
    33.20.Bx
    36.40.Mr
    Opis:
    The rotational spectrum of the two most abundant isotopomers of the weakly bound dimer between dinitrogen and hydrogen bromide, $\text{}^{14}$N$\text{}_{2}$···H$\text{}^{79}$Br and $\text{}^{14}$N$\text{}_{2}$···H$\text{}^{81}$Br, has been measured for the first time. The three lowest J transitions, at frequencies from 2 to 8 GHz, have been studied at conditions of supersonic expansion. The complicated hyperfine splitting structure arising from the three non-equivalent quadrupolar nuclei has been assigned and fitted. The resulting spectroscopic constants and the derived molecular quantities are compared with those for other isotopomers, as well as with experimental and calculated results for other linear dimers involving dinitrogen. A revised value for the nuclear quadrupole splitting constant for free nitrogen molecule,ρ(N)=-5.3(1) MHz, is also derived.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 2; 231-242
    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:
    Molecular Dynamics of Tert-butyl Chloride Confined to CPG (7.4, 15.6 nm)
    Autorzy:
    Szutkowska, L.
    Peplińska, B.
    Jurga, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043639.pdf
    Data publikacji:
    2005-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.Es
    81.05.Rm
    33.15.Vb
    33.20.Bx
    68.35.Rh
    Opis:
    The paper complements our earlier NMR investigation of molecular dynamics of tert-butyl chloride restricted by geometries of the type MCM-41 and CPG by the new sizes of CPG and by differential scanning calorimetry method. We report proton and deuteron NMR lineshapes and the spin-lattice relaxation results of tert-butyl chloride in CPG of the 15.6 nm and 7.4 nm pore diameter in the temperature range 70 K≤ T≤ 292 K. The bulk-like component of the confined tert-butyl chloride, in temperatures corresponding to phase III, is interpreted as a composition of two dynamically different subphases. The parameters of motions of both subphases are derived. The tert-butyl group motion in both subphases is more restricted than in the bulk tert-butyl chloride, although the activation energies are lower. Differential scanning calorimetry was used to determine temperatures of the phase transitions (140 K≤T≤292 K). The results show that the depression of the phase transition temperature is pore size dependent and that the confinement has less influence on transition to the plastic phase than on the freezing and on the solid II - solid III transition.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 2; 357-370
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric Dipole Moments of Acetone and of Acetic Acid Measured in Supersonic Expansion
    Autorzy:
    Dorosh, O.
    Kisiel, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814018.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.Ar
    32.10.Dk
    32.30.Bv
    32.60.+i
    33.15.Kr
    33.1.Mt
    33.20.Bx
    33.20.Sn
    Opis:
    Precise values for electric dipole moments of isolated acetone and acetic acid molecules were determined from the Stark effect measurements made on lowest J rotational transitions at conditions of supersonic expansion. The new results are $μ_{tot} =μ_b$ =2.9345(22) D for acetone from measurements on the $1_{11}$← $1_{01}$ transition, and $μ_a$ =0.8631(8), $μ_b$ =1.4345(11), $μ_{tot}$ =1.6741(10) D for acetic acid, from measurements on $1_{11}$ ← $0_{00}$ and $1_{01}$ ← $0_{00}$ transitions. A comparison with previous determinations and with results of quantum chemical calculations is presented.
    Źródło:
    Acta Physica Polonica A; 2007, 112, S; S-95-S-104
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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