Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 3

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Rationalization of Spectra of Rare Earths in Condensed Matter

100%
Reisfeld R., Jørgensen C.
Acta Physica Polonica A
|
1993
|
vol. 84
|
issue 5
1011-1019
EN
The parametrized models are compared with counter-intuitive consequences of the non-relativistic Schrödinger treatment. For both 4f^{ q}, 5f^{ q} and d^{9} systems in condensed matter, the energy levels must be strongly influenced by correlation effects. The parametrization of intensities is conceptually very different for f^{ q} and d^{9} compounds. The bandwidths of absorption and luminescence are discussed and related to the Born-Oppenheimer factorization.
2
Content available remote

The Influence of the Temperature on Positron Annihilation Lifetime Spectra in Porous Sol-Gel Glass Doped with Ag Nanoparticles

81%
Gorgol M., Jasińska B., Reisfeld R., Levchenko V.
|
|
vol. 125
|
issue 3
778-781
EN
Silver nanoparticles with continuous size distribution from 10 to 20 nm were incorporated into porous glass produced using sol-gel technique. Positron annihilation lifetime spectroscopy was used to compare obtained material with an undoped reference glass. The positron annihilation lifetime spectroscopy measurement were made in a broad temperature range (from - 180C to 200°C). The experimental lifetime values were compared with the predictions of the extended Tao-Eldrup model of the temperature range. Experimental results for the reference material were in agreement with the model, except for a small discrepancy at low temperatures. In doped material substantial changes and non-monotonous temperature dependences of intensity and lifetime values were observed. Heating the material to 200C resulted in reorganization of the material structure.
3
Content available remote

Luminescence of Eu(III), Pr(III) and Sm(III) in Carbonate-Fluor-Apatite

61%
Gaft M., Reisfeld R., Panczer G., Shoval S., Garapon C., Boulon G., Stręk W.
Acta Physica Polonica A
|
1996
|
vol. 90
|
issue 2
267-274
EN
The purpose of this work was identification of luminescent lines occurring in natural carbonate-fluor-apatite (francolite) mineral. For identification of several rare earth ions occurring in natural francolite, the luminescence of rare earth ions was extensively studied in artificial mineral consisting of a pure francolite (not containing rare earth) of the composition Ca_{5}(PO_{4})_{3} (F,O):Ca_{5}(PO_{4})_{3} CO_{3} activated with Pr, Eu and Sm ions and then compared with the luminescence features observed in natural mineral.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.