Zobrazeno 1 - 10
of 32
pro vyhledávání: '"H. Kröse"'
Publikováno v:
Applied Physics B: Lasers and Optics. 67:79-86
crystals are given. The extension of this type of spectroscopy to other fields, where correlation between EPR and optical phenomena is essential, is discussed.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cb0333f87ac3ce707896c5abb56ed060
https://doi.org/10.1007/s003400050478
https://doi.org/10.1007/s003400050478
Publikováno v:
Physical Review B. 53:116-125
In ${\mathrm{BaTiO}}_{3}$ the alkali ions Na and K, replacing Ba, lead to acceptor levels about 50 meV above the valence band edge. The structure of these defects can be studied by electron spin resonance, after light induced valence-band holes have
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7cb5dad27d9c9bb93f0ac00db7a9a8d6
https://doi.org/10.1103/physrevb.53.116
https://doi.org/10.1103/physrevb.53.116
Publikováno v:
Applied Physics B Laser and Optics. 61:1-7
By combined studies of electron spin resonance and optical absorption at low temperatures, the charge-transfer bands of Rh5+ and Rh4+ are identified to be peaked near 1.6 and 1.9 eV, respectively. On this basis, the light-induced charge-transfer proc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::847354b50ba6e59a6d10031013f2d0f2
https://doi.org/10.1007/bf01090965
https://doi.org/10.1007/bf01090965
Autor:
H. Hesse, T. Varnhorst, O. F. Schirmer, R. Scharfschwerdt, C. Kuper, E. Possenriede, H. Kröse
Publikováno v:
Optical Materials. 4:153-157
An optical method is presented which allows to identify at room temperature the photoinduced charge transfers between different defects in photorefractive crystals. The analysis is based on the labelling of the opticfal spectra with the corresponding
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6d6bf166c618681aabe6b17872c8607a
https://doi.org/10.1016/0925-3467(94)00053-0
https://doi.org/10.1016/0925-3467(94)00053-0
Publikováno v:
Ferroelectrics. 151:199-204
Two shallow O- trapped hole centers in BaTiO3 are identified to arise from association with Na+ and Ptx+. In material with decreased acceptor concentration, ESR of Ti3+ small polarons and Ti3+-Nb5+ pairs is found. The role of such centers in light in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dc59fbb0a9df9537624a42df5e1e4f02
https://doi.org/10.1080/00150199408244743
https://doi.org/10.1080/00150199408244743
Publikováno v:
Applied Physics A Solids and Surfaces. 55:73-81
On the basis of a previous identification of paramagnetic defects in nominally undoped as grown BaTiO3 single crystals, we have investigated the changes of the concentrations of these centers and their optical absorptions under illumination with ligh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e08e4865623031750e0b3956466b1d48
https://doi.org/10.1007/bf00324605
https://doi.org/10.1007/bf00324605
Publikováno v:
Ferroelectrics. 125:343-348
By investigating the concentrations of paramagnetic centers in two nominally undoped BaTiO3 single crystals at low temperatures as depending on illumination with light of varying wavelengths the resulting charge transfer processes could partly be ide
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::abd8264975c3179fd8ad6c3b02b4bac2
https://doi.org/10.1080/00150199208017091
https://doi.org/10.1080/00150199208017091
Publikováno v:
Radiation Effects and Defects in Solids. :681-686
We report the ESR of Nd3+ in BaTiO3 and derive the electronic structure of its groundstate. – Among the light induced charge conversions found with ESR in nominally undoped BaTiO3 crystals hole photoionization of Fe4+ is the most important. The pro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::16a6cee446404458f38e6faf5402dd90
https://doi.org/10.1080/10420159108220802
https://doi.org/10.1080/10420159108220802
Publikováno v:
Photorefractive Materials, Effects, and Devices.
What are the defects responsible for the photorefractive effect in BaTiO3? What charge con version processes involving these defects are taking place during illumination? Along which energetic paths are charges transported? These questions have to be
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::40ea8844bd0713783462b768c887fa22
https://doi.org/10.1364/pmed.1991.wb1
https://doi.org/10.1364/pmed.1991.wb1