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1

Influence of Configuration Interaction on the Magnetic Circular Dichroism Spectra of C_{60} Molecule

100%

Pilch M., Pawlikowski M.

Acta Physica Polonica A

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1993

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vol. 84

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issue 6

1049-1054

EN

A_{1}/D_{0} and D_{0} characteristics of magnetic circular dichroism and absorption spectra are studied for the low-energy A_{g} → T_{1u} transitions in the C_{60} molecule in terms of the self-consistent field Parieser-Parr-Pople method applied in the full configuration interaction-1 treatment. The effects are discussed at different levels of configuration interaction and the results are compared to the earlier ones obtained From the CNDO/S method. We argue that the earlier treatment fails to account correctly for the experimental magnetic circular dichroism and absorption spectra of C_{60} molecule. This is most probably due to deficiency of the configuration interaction basis set and/or to the intrinsic parametrization of complete neglect of differential overlap method.

2

Jahn-Teller and Herzberg-Teller Couplings in Absorption and Magnetic Circular Dichroism Spectra of (E+E)∗e Systems

63%

Pilch M., Pawlikowski M.

Acta Physica Polonica A

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1992

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vol. 81

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issue 6

619-627

EN

Model calculations are reported for an (E+E)∗e system including linear and quadratic Jahn-Teller and Herzberg-Teller vibronic interactions. The effects of these interactions on magnetic circular dichroism and absorption spectra are compared with experimental observations on CoF^{3-}_{6} salts.

3

Analysis of Emission and Vibronic Transitions in Uranium(3+) Doped Cs_{2}LiYCl_{6} Single Crystals

51%

Karbowiak M., Simoni E., Drożdżyński J., Hubert S.

Acta Physica Polonica A

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1996

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vol. 90

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issue 2

367-370

EN

Uranium(3+) doped single crystals of Cs_{2}LiYCl_{6} with a 0.3 and 2.0% U^{3+} concentration have been obtained by the Bridgman-Stockbarger method. Luminescence spectra of the crystals were recorded at 27 and 15 K, respectively. The emission bands observed in the visible and near infrared regions have been assigned to transitions from the ^{4}I_{11/2}, ^{4}F_{3/2}, and ^{4}G_{7/2} levels to the ^{4}I_{9/2} ground level.

4

Luminescence and Excitation Spectra of U^{3+} doped RbY_{2}Cl_{7} Single Crystals

51%

Karbowiak M., Murdoch K., Drożdżyński J., Edelstein N., Hubert S.

Acta Physica Polonica A

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1996

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vol. 90

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issue 2

371-376

EN

Uranium(3+) doped single crystals of RbY_{2}Cl_{7} with a uranium concentration of 0.05% and 0.2% were grown by the Bridgman-Stockbarger method using RbU_{2}Cl_{7} as the doping substance. Polished plates of ca. 5 mm in diameter were used for measurements of luminescence and excitation spectra. Since the U^{3+} ions occupy two somewhat different site symmetries, a splitting of all observed f-f bands was observed. The analysis of the spectra enabled definitively an assignment of 22 crystal field bands for both site symmetries as well as the total crystal field splitting of the ground level, equal to 473 cm^{-1} and 567 cm^{-1} for the first and second site symmetry, respectively.

5

Excited States in Solid Phenothiazine as Studied by Electroabsorption Spectroscopy

51%

Kalinowski J., Stampor W., Fattori V., Di Marco P.

Acta Physica Polonica A

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1995

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vol. 87

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issue 6

953-964

EN

Electric field modulated absorption spectra of vapor deposited layers of phenothiazine, explained in terms of a quadratic Stark effect, indicate modification of intramolecular (Frenkel-type) excitons by charge transfer transitions throughout UVIS absorption spectrum in the range 250-450 nm. The charge transfer character of the excited states appears at energies characteristic of various oxidation products of phenothiazine as identified from a spectroscopic study of photochemical air oxidation, performed on solution and solid film samples of this compound. The charge transfer transitions are ascribed to electron transfer between the molecules of phenothiazine and their oxidized species created in the samples during preparation and handling procedures.

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5 Acta Physica Polonica A

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2 Drożdżyński J.

2 Hubert S.

2 Karbowiak M.

2 Pawlikowski M.

2 Pilch M.

1 Di Marco P.

1 Edelstein N.

1 Fattori V.

1 Kalinowski J.

1 Murdoch K.

1 Simoni E.

1 Stampor W.

Influence of Configuration Interaction on the Magnetic Circular Dichroism Spectra of C_{60} Molecule

Jahn-Teller and Herzberg-Teller Couplings in Absorption and Magnetic Circular Dichroism Spectra of (E+E)∗e Systems

Analysis of Emission and Vibronic Transitions in Uranium(3+) Doped Cs_{2}LiYCl_{6} Single Crystals

Luminescence and Excitation Spectra of U^{3+} doped RbY_{2}Cl_{7} Single Crystals

Excited States in Solid Phenothiazine as Studied by Electroabsorption Spectroscopy