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Wyszukujesz frazę "33.20.Sn" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    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:
    Analysis of the Origin Band of Acridine Dimer Fluorescence Excitation Spectrum - Conformations of Jet-Cooled Acridine Dimer
    Autorzy:
    Deperasińska, I.
    Prochorow, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2029255.pdf
    Data publikacji:
    2001-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Sn
    33.70.-w
    Opis:
    The analysis of rotational band contour for the origin transition of fluorescence excitation spectrum of acridine dimer, earlier observed under conditions of jet-cooling in supersonic helium expansion, has been performed. An optimized ground-state equilibrium structure of acridine dimer fits the approximation of asymmetric top rigid rotor. In this approximation rotational constants were determined and an A-type rotational band was computed. It has turned out that the computed rotational band contour is much narrower than the experimental one. In search for the reasons of this discrepancy between calculations and experiment, an analysis of relative rotational motion of acridine moieties of the dimer was carried out. It was found that minima of potential energy curves for rotational motion, although very flat, under conditions of supersonic expansion can acquire (in their shallow local minima) non-vanishing population of slightly different conformations of the dimer. It was shown that in terms of non-statistical distribution of such populations, the origin bands of individual conformations may contribute to the experimental band contour.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 6; 845-858
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reanalysis of the Ångström System $(B^1 Σ^{+} - A^1 \Pi)$ in the $\text{}^{13}C^{16}O$ Isotopic Molecule
    Autorzy:
    Hakalla, R.
    Szajna, W.
    Zachwieja, M.
    Kępa, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418230.pdf
    Data publikacji:
    2012-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Kf
    33.20.Sn
    33.15.Mt
    Opis:
    The emission spectrum of the Ångström system $(B^1 Σ^{+} - A^1 \Pi)$ of $\text{}^{13}C^{16}O$ was obtained under high resolution with an accuracy estimated to be ± 0.002 $cm^{-1}$ as an emission spectrum using a high accuracy dispersive optical spectroscopy. The light source was a hollow-cathode lamp with two anodes built in our laboratory, with a previously deposited small quantity of $\text{}^{13}C$ carbon on the electrodes. The emission from the discharge was observed with a plane grating spectrograph and recorded by a photomultiplier tube. In total 195 transition wave numbers belonging to the strongest 0-1 and 0-2 bands of the B - A system were precisely measured. The modern rotational reanalysis made it possible to verify the molecular information for the both combining states of the Ångström system. In particular the rovibrational constants for the $B^1 Σ^{+}$ Rydberg state have been significantly improved ($B_0$ = 1.8625054(65) $cm^{-1}$ and $D_0=6.1384(52) \times 10^{-6} cm^{-1}$) and the obtained equilibrium rotational constants of this state are more accurate than known to date. Numerous rotational perturbations observed in the $A^1$ Π state were reanalysed and confronted with the previously known ones.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 4; 674-682
    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 1-4 z 4

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