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1

Spectroscopic Ellipsometry of Porphyrin Adsorbed in Porous Silicon

100%

Babonas G., Snitka V., Rodaitė R., Šimkienė I., Rėza A., Treideris M.

Acta Physica Polonica A

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2005

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vol. 107

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issue 2

319-323

EN

Aqueous solution of meso-tetra(4-sulfonatophenyl)porphine was deposited on electrochemically etched n-Si wafers. The morphology of the hybrid systems was investigated by scanning electron microscope and atomic force microscope techniques. The optical response of the hybrid systems was studied by spectroscopic ellipsometry in the range of 1-5 eV. Particular features in adsorption process were revealed for meso-tetra(4-sulfonatophenyl)porphine deposited on variously chemically treated Si substrates. It was found that porphyrin J-aggregates can be intercalated into large pores formed in a bulk n-Si as well as into nanopores of luminescent oxide layer.

2

Formation of Iron-Containing Clusters in Silica of Predetermined Porosity

84%

Šimkiene I., Baran M., Babonas G., Bendorius R., Rėza A., Szymczak R., Aleshkevych P., Šustavičiūtė R., Tamaševičius R.

Acta Physica Polonica A

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2005

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vol. 107

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issue 2

400-407

EN

Iron-containing nanoparticles and clusters were formed in silica with porosity, which was predetermined by different procedures of sol-gel technology and the chemical composition of precursors. Bulk and layer-type samples of different porosity were synthesized and investigated. The morphology, magnetic, and optical properties were studied to characterize the samples and to analyze the formation of Fe-oxides. Experimental results showed that both Fe_2O_3 and Fe_3O_4 were formed in the samples and that their relative amount was dependent on preparation technology.

3

Photoemission and Optical Spectroscopy of i-ZnMgEr Quasicrystal

84%

Suchodolskis A., Assmus W., Babonas G., Giovanelli L., Karlsson U., Karpus V., Le Lay G., Rėza A., Uhrig E.

Acta Physica Polonica A

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2005

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vol. 107

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issue 2

412-419

EN

The results of photoemission and optical studies of icosahedral single-grain ZnMgEr quasicrystals are presented. Synchrotron radiation photoemission measurements were performed on in situ cleaved samples at 10^{-10} mbar pressure and low, 140-150 K temperature. The valence band photoemission spectra measured reveal a simple metal-type valence band of icosahedral ZnMgEr with a distinct Fermi edge cut-off and with a sharp pseudogap feature. The photoemission spectra of shallow Mg 2p and Zn 3d core levels indicate a coordination shift of Mg 2p spin-orbit doublet and an oscillating dependence of Zn 3d photoemission line components on the photon energy within the hν=20-160 eV range investigated. The optical response of icosahedral ZnMgEr, a dispersion of the dielectric function, was measured by the spectroscopic ellipsometry technique in the 0.5-5.0 eV spectral range. The optical spectra of the quasicrystal indicate the Drude-type optical response superimposed with a peak of interband optical transitions. The interband optical transitions can be modelled with the pseudogap parameters which agree with those deduced in an analysis of the photoemission valence band spectra.

4

Optical Response of fci-ZnMgHo Quasicrystal

84%

Karpus V., Babonas G., Rėza A., Suchodolskis A., Tumėnas S., Hunderi O., Assmus W., Brűhne S.

Acta Physica Polonica A

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2008

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vol. 113

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issue 3

1005-1008

EN

The results of an optical spectroscopy study of the icosahedral fci-ZnMgHo quasicrystal are presented. The dielectric function of the quasicrystal was measured by the spectroscopic ellipsometry technique in the spectral range of 0.1-5.0 eV. The analysis of the dielectric function shows that an optical response of fci-ZnMgHo is a superposition of the free-electron Drude-type contribution and that of the interband transitions across the fci-ZnMgHo pseudogap.

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4 Acta Physica Polonica A

1 2008

3 2005

4 Babonas G.

4 Rėza A.

2 Assmus W.

2 Karpus V.

2 Suchodolskis A.

1 Aleshkevych P.

1 Baran M.

1 Bendorius R.

1 Brűhne S.

1 Giovanelli L.

1 Hunderi O.

1 Karlsson U.

1 Le Lay G.

1 Rodaitė R.

1 Snitka V.

1 Szymczak R.

1 Tamaševičius R.

1 Treideris M.

1 Tumėnas S.

1 Uhrig E.

1 Šimkiene I.

1 Šimkienė I.

1 Šustavičiūtė R.

Spectroscopic Ellipsometry of Porphyrin Adsorbed in Porous Silicon

Formation of Iron-Containing Clusters in Silica of Predetermined Porosity

Photoemission and Optical Spectroscopy of i-ZnMgEr Quasicrystal

Optical Response of fci-ZnMgHo Quasicrystal