Temat: 39.90.+d - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Device for compressibility and thermal expansion study up to 3 GPa
Autorzy:: Krupski, M.
Krupska, A.
Powiązania:: https://bibliotekanauki.pl/articles/1058546.pdf
Data publikacji:: 2016-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 39.90.+d
Opis:: We present the realization of a project of a device utilizing a standard high-pressure chamber adapted to compressibility and thermal expansion measurements of solids at hydrostatic pressures up to 3 GPa. The device has been tested on the triglycine sulphate crystal (TGS).
Źródło:: Acta Physica Polonica A; 2016, 130, 6; 1324-1325
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Positron Scattering on Atoms and Molecules in the Limit of Low Energy
Autorzy:: Karwasz, G. P.
Brusa, R. S.
Pliszka, D.
Idziaszek, Z.
Nowakowska, H.
Powiązania:: https://bibliotekanauki.pl/articles/2047133.pdf
Data publikacji:: 2006-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 34.85.+x
39.90.+d
Opis:: Starting from experimental cross-sections for positron scattering in argon and nitrogen, we examine different energy ranges. In the zero-energy limit the cross-section falls with energy and can be described by modified effective range theory for polarization potential. In a few eV range the cross-sections are constant vs. energy. As far as it is possible to force the elastic scattering phase shifts in a way that both experimental differential cross-sections are reproduced and the total cross-section remains constant in energy, such a model lacks the physical justification. Only the virtual-positronium model, developed recently by Gribakin, reproduces a constant dependence of the total cross section in a few eV energy range.
Źródło:: Acta Physica Polonica A; 2006, 110, 5; 605-614
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Low Energy Cross-Sections for Positron Interactions with Cyclic Hydrocarbons
Autorzy:: Karwasz, G. P.
Pliszka, D.
Brusa, R. S.
Perazzolli, C.
Powiązania:: https://bibliotekanauki.pl/articles/2042198.pdf
Data publikacji:: 2005-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 34.85.+x
39.90.+d
Opis:: We report total cross-section measurements for positron scattering on cyclic hydrocarbons: benzene, aniline, and cyclohexane. Measurements were done by an absolute transition method in the energy range 1.5-20 eV (0.4-20 eV for cyclohexane). High cross-sections for all measured molecules were observed at low energies. In the case of cyclohexane the cross-section in the zero energy limit tends to a constant value. In aniline a weakly accented peak slightly above the positronium formation threshold is observed. Similar but less visible bump was observed in the case of benzene. Measurement of total cross-sections in nitrogen and argon used for calibration of the apparatus are also presented.
Źródło:: Acta Physica Polonica A; 2005, 107, 4; 666-672
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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