Results 251 to 260 of about 69,355 (279)

Trapping center parameters in In6S7 crystals

Physica B: Condensed Matter, 2011
Abstract Thermally stimulated current measurements were carried out on In 6 S 7 single crystals in the temperature range of 10–225 K with a constant heating rate of 0.8 K/s. The study of trapping centers was accomplished by the measurements of current flowing along the c -axis of crystals. The analysis of the glow curve according to various methods,
M. Isik, N.M. Gasanly
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Transient color centers in GGG crystals

Radiation Effects and Defects in Solids, 2002
Electron pulse induced absorption and their decay kinetics have been investigated in samples of GGG crystals with different starting absorption spectra. It is shown that for all samples there appears a wide transient absorption (TA) band with two maxima in the region 14,000-17,000 v cm m 1 and 22,000-26,000 v cm m 1 .
P. Potera, A. Matkovskii, D. Sugak, L. Grigorjeva, D. Millers, V. Pankratov   +5 more
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Molybdenyl centers in NH4Cl single crystals

The Journal of Chemical Physics, 1977
Molybdenyl centers are studied in single crystals of NH4Cl using a set of correlated experimental techniques like EPR, optical absorption, infrared absorption, conductivity, and dielectric loss. EPR studies on NH4Cl single crystals doped with (MoOCl5)2− are made over a wide temperature range. At room temperature the resonance due to even isotopes of Mo
S. Radhakrishna, B. V. R. Chowdari, A. Kasi Viswanath   +2 more
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Luminescence Centers in Crystals

1976
Investigation of the Spectral-Luminescence Properties of Ruby as Active Laser Medium.- I. Spectral Distribution of Luminescence Quantum Efficiency and Absorption Spectra.- II. Phosphorescence of Ruby. Energy Band Scheme.- III. Color Centers in Ruby.- IV.
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Crystal Field at the Impurity Center Sites in Ionic Crystals

Physics of the Solid State, 2005
Perturbation theory is developed for second-quantized operators in a basis of partly nonorthogonal orbitals. This method may be helpful in carrying out ab initio calculations of the parameters of the crystal field at the impurity center sites. As an illustration, when estimating the crystal field parameters for Yb3+: KZnF3, some fitting parameters are ...
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New Color Centers in KCl Crystals

physica status solidi (b), 1973
AbstractNew absorption centers giving bands with maxima at 555 nm (Y) and 625 nm (Y′) at liquid‐nitrogen temperature, were observed in OH–containing KCl single crystals annealed in vacuum a t 600 °C and subsequently uv irradiated. The thermal bleaching of these bands yields F centers.
G. Matsumura, G. C. Kuczynski
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Luminescence centers in SnO2 single crystals

Solid State Communications, 1978
Abstract The luminescence spectrum observed in SnO 2 has been analyzed based on the vibroelectronic model. However, additional measurements of the photoconductivity and the spectral distribution of recombination probability cannot be explained by this model, which only takes into account strong phonon coupling.
M. De Murcia, M. Egee, J.P. Fillard
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Pr3+ Centers in YSZ single crystals

Journal of Alloys and Compounds, 2001
Abstract The low-temperature optical-absorption and fluorescence spectra of Pr 3+ ions in yttria stabilized zirconia single crystals were extensively investigated. From total site selective spectroscopy and time resolved measurements, at least three different optical centers were identified and associated with Pr 3+ ions in two different ...
J.E Muñoz-Santiuste, B Savoini, R González   +2 more
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Europium emission centers in CsI:Eu crystal

Optical Materials, 2013
Absorption, excitation and luminescence spectra of pure and Eu doped CsI crystals were studied depending on the activator content, excitation energy, heat treatment and X-ray irradiation. Several types of Eu2+ related centers were found. It is shown that complex centers are stable at room temperature but their structure and concentration changes at ...
Gektin, A., Shiran, N., Vasyukov, S., Belsky, A., Sofronov, D.   +4 more
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Color Centers in ZnS Single Crystals

The Journal of Chemical Physics, 1961
Absorption bands induced in ZnS crystals by uv (0.366 μ) are described. The two main absorption bands peaked at or below 0.6 μ and at 1.2 μ. Two weaker bands at 0.8 and 1.35 appear as shoulders of the main bands. Thermal and optical bleaching properties are also described, and the results are shortly discussed in light of a formerly proposed model.
A. Halperin, R. Pinker
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