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    Wyświetlanie 1-4 z 4
    Tytuł:
    Photo-Induced Structural Changes at a Surface οf Organic Single Crystals Observed by Vibrational Sum Frequency Generation Spectroscopy
    Autorzy:
    Fukumoto, K.
    Fukazawa, N.
    Ishikawa, T.
    Koshihara, S.
    Yamamoto, H.
    Kato, R.
    Onda, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1489956.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Me
    68.35.Rh
    68.35.Ja
    Opis:
    Phase transitions from insulator to metal induced by thermal excitation and by photo-irradiation at the surface of β'-(BEDT-TTF)(TCNQ) are investigated using vibrational sum frequency generation spectroscopy. The results are compared with linear reflectivity measurements which detect the information mainly from bulk. IR absorption spectra of $a_{g}$ vibrational modes of TCNQ induced by the dimerization are observed using vibrational sum frequency generation spectroscopy, and its intensity is found to become smaller by thermal excitation indicating the transition to the metal phase. Time-dependent degree of dimerization is also observed by pump-probe experiments with almost the same statistics as the static measurements. On the other hand, in the reflectivity experiments, the reduction of dimerization is also observed by elevating the temperature, however, the spectral shapes are deformed for the time-resolved measurements. These results imply that the different dynamics occur at the surface and in the bulk.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2; 313-315
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Slow Dynamics of the Photoinduced Phase Transition in $Pd(dmit)_2$ Salts (dmit = 1,3-dithiol-2-thione-4,5-dithiolate)
    Autorzy:
    Ishikawa, T.
    Tanaka, T.
    Fukazawa, N.
    Matsubara, Y.
    Okimoto, Y.
    Onda, K.
    Koshihara, S.
    Tamura, M.
    Kato, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1408855.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Me
    78.47.D-
    78.47.jg
    78.55.Kz
    78.66.Qn
    Opis:
    Slow dynamics of the initially photoinduced state has been observed by the pump-probe type time-resolved reflection spectroscopy in the charge separated phase of the half-filled strong dimer system, $Et_2Me_2Sb[Pd(dmit)_2]_2$ (dmit = 1,3-dithiol-2-thione-4,5-dithiolate). We have succeeded to reproduce the probe photon energy dependence of the time profile qualitatively in the time delay range from 10 ps to 1 ns assuming the dynamical expansion of the domain of the photo-induced dimer-Mott insulating phase in the host charge-separated one.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2B; 316-318
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence Analysis of Oxygen Precipitation around Small-Angle Grain Boundaries in Multicrystalline Silicon Wafers
    Autorzy:
    Kato, G.
    Tajima, M.
    Okayama, F.
    Tokumaru, S.
    Sato, R.
    Toyota, H.
    Ogura, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1382111.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Ap
    61.72.Qq
    82.80.Rt
    88.40.jj
    Opis:
    We have investigated the correlation between deep-level photoluminescence and the density of small-angle grain boundaries in multicrystalline Si. A deep-level photoluminescence component around 0.87 eV, which we previously ascribed to oxygen precipitates, became lower and higher in the region with high and low density of small-angle grain boundaries, respectively. This can be explained by the differences in the availability of oxygen atoms around respective small-angle grain boundaries. We performed focused ion beam time-of-flight secondary ion mass spectroscopy on special points emitting extremely strong 0.87 eV emission, and detected a clustered area of $\text{}^16O¯$. This is strong evidence for the idea that the 0.87 eV band is due to oxygen precipitates.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 1010-1012
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variable Temperature STM/STS Investigations of Ag Nanoparticles Growth on Semiconductor Surfaces
    Autorzy:
    Suto, S.
    Czajka, R.
    Szuba, S.
    Shiwa, A.
    Winiarz, S.
    Nagashima, H.
    Kato, H.
    Yamada, T.
    Kasuya, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036896.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Ef
    68.47.Fg
    68.55.Ac
    Opis:
    We have investigated the growth of Ag nanoparticles deposited on Si(111), H/Si(111)-(1×1) and Bi$\text{}_{2}$Te$\text{}_{3}$ substrates using a variable temperature scanning tunneling microscopy. These substrates are different as regards the model system for cluster and islands growth at the nanometer scale. Ag was evaporated onto the sample mounted at the scanning tunneling microscopy stage in vacuum of 10$\text{}^{-10}$ Torr range during evaporation. The substrates were kept at different temperatures: -150˚C, room temperature, and 300˚C during the deposition process. In general, we have observed 3D growth mode up to several ML coverage. The density of clusters and their size were functions of the substrate's temperature during the deposition process - a higher density and a smaller size at -150˚C were in opposition to the 300˚C results - a lower density and a larger size. Low temperature depositions led to continuous layers above 10 ML coverage but the surface was covered by small Ag clusters of 1-2 nm in heights and 2-3 nm in diameters. The log-log graphs of height and projected diameter of Ag clusters revealed different slopes indicating different growth mechanisms at low and high temperatures. We obtained the value of n=0.25±0.02, typical of the so-called droplet model of cluster growth, only at 300˚C. Scanning tunneling spectroscopy measurements revealed clearly different I-V (and dI/dV vs. bias voltage) curves measured above clusters and directly above the substrate. In discussion, we compared our results to theoretically calculated density of states from other papers, finding conformity for partial density of states.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 3-4; 289-302
    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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