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Wednesday, July 15, 2020 | History

2 edition of Color centers in alkali halides. found in the catalog.

Color centers in alkali halides.

International Symposium: Color Centers in Alkali Halides Rome 1968.

Color centers in alkali halides.

Consiglio nazionale delle ricerche, Rome, September 23-27, 1968 ...

by International Symposium: Color Centers in Alkali Halides Rome 1968.

  • 283 Want to read
  • 22 Currently reading

Published by Tip. S. Pio X in Roma .
Written in English

    Subjects:
  • Color centers -- Congresses.,
  • Alkali metal halide crystals -- Congresses.

  • Edition Notes

    ContributionsInternational Union of Pure and Applied Physics., Consiglio nazionale delle ricerche (Italy), Italy. Ministero della pubblica istruzione.
    Classifications
    LC ClassificationsQD921 .I54 1968
    The Physical Object
    Paginationx, 315 p.
    Number of Pages315
    ID Numbers
    Open LibraryOL5341290M
    LC Control Number72195153

    The optical properties of color centers involving trapped electrons in LiH show that properties of the crystalline media other than the lattice parameter are important in relation to the energy of the optical absorption bands. The F band in LiH is found at ev instead of at ev, as predicted by the Ivey formula for F bands in the alkali. Color Centers F Centers Other Centers in Alkali Halides Problems Chapter Dislocations Shear Strength of Single Crystals Slip Dislocations Burgers Vectors Stress Fields of Dislocations Low-angle Grain Boundaries Dislocation Densities Dislocation Multiplication and Slip Strength.

      The effect of pressure on various color centers in silver‐doped alkali halides has been studied. The crystals include NaCl (two concentrations), KCl, and KBr. The resulting shifts are used to confirm the assignments of some peaks, and, in certain cases, to decide among conflicting by: 8. As a result, a major part of scientific research in solid-state physics has,' from the early studies of "color centers" in alkali halides to the present vigorous investigations of deep levels in semiconductors, been devoted to the study of defects/5(4).

    The Paperback of the Excitonic Processes in Solids by Masayasu Ueta, Hiroshi Kanzaki, Koichi Kobayashi, Yutaka Toyozawa | at Barnes & Noble. - Localized Electrons and Holes in Silver Halides.- Nature of Localized Centers in Silver Halides Compared to Color Centers in Alkali Halides.- Bound Polarons in Silver and Alkali.   Color Centers F Centers Other Centers in Alkali Halides Problems Chapter Dislocations Shear Strength of Single Crystals Slip Dislocations Burgers Vectors Stress Fields of Dislocations Low-angle Grain Boundaries Dislocation Densities Dislocation Multiplication and Slip Strength Brand: Wiley.


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Color centers in alkali halides by International Symposium: Color Centers in Alkali Halides Rome 1968. Download PDF EPUB FB2

An F-center, Farbe center or color center (from the original German Farbzentrum, where Farbe means color and zentrum means center) is a type of crystallographic defect in which an anionic vacancy in a crystal lattice is occupied by one or more unpaired ons in such a vacancy tend to absorb light in the visible spectrum such that a material that is usually.

(Stichworte: Physical Properties of Crystals, Color Center Research, Trapped-Electron Color Centers in Alkali Halides, Trapped-Hole Color Centers in Alkali Halides, Coloration and Impurities in the Alkali halides, Coloration and the Mechanical Properties of Alkali halides, Production of Color Centers by Ionizing Radiation, Photoelectric.

These notes offer a comprehensive discussion of the experimental and theoretical work done so far on the F' centers in alkali halides. Here the F' center is a two-electron single-anion-vacancy entity with no other anion vacancies in its immediate neighbourhood.

This definition allows Color centers in alkali halides. book the inclusion of pair interactions between color center species which occupy a central position in the book.

Get this from a library. F' centers in alkali halides. [Mladen Georgiev] -- These notes offer a comprehensive discussion of the experimental and theoretical work done so far on the F' centers in alkali halides. Here the F' center is a two-electron single-anion-vacancy entity.

a crystal defect that absorbs light in a spectral region in which the crystal itself does not absorb light (seeSPECTROSCOPY,).Originally, the term “color centers” was applied only to F-centers (derived from the German word Farbenzentren, or “color centers”).F-centers were first discovered in alkali halide crystals by R.

Pohl and co-workers in Germany in the ’s. absorbed absorption bands absorption spectrum additively colored alkali halide crystals alkali halides alkali ion Amer anion arise bleaching C. Klick calculated cation centers formed Chem colloidal color centers concentration of F configuration crystals containing curve deformation density dislocation line divalent electric field electron.

Additional Physical Format: Online version: Georgiev, Mladen, F' centers in alkali halides. Berlin ; New York: Springer-Verlag, © (OCoLC) Color Centers in alkali halides display an optical cycle which has been and it is still today a model case for similar processes in other materials.

Moreover the luminescence of some color centers is so efficient that it has been used in laser by: 4. Abstract. Two different classes of nonlinear optical phenomena are present in color centers in alkali halides.

One is the direct consequence of applying very intense electromagnetic fields, which results for instance in two and also three photon absorption with selection rules different from those of the much more usual one photon : G.

Baldacchini. Download online ebook EN Pdf. Advances in the Theory of Atomic and Molecular Systems: Dynamics, Spectroscopy, Clusters, and Nanostructures (Progress in. Color centers. Atomic and electronic defects of various types which produce optical absorption bands in otherwise transparent crystals such as the alkali halides, alkaline earth fluorides, or.

Dyelike lasers for the 2- m region using F2+ centers in alkali halides L.F. Mollenauer (Optics Letters ) Broadly tunable cw lasers using F2+ centers for the and m bands L.F. Mollenauer, D.M. Bloom, A.M.

DelGaudio (Optics Letters ). Color centers have been studied in CsBr single crystals additively colored with potassium or cesium. More than ten absorption bands were produced, most of which had previously been found in crystals colored by ionizing radiation.

All bands produced by irradiation at or above liquid nitrogen temperature appear to arise from trapped by: By x-irradiation of alkali halides (LiF, NaCl, KCl, and KBr) at liquid ; nitrogen temperature electron defect centers are created which can be described ; as halogen moleculeions oriented along Author: Kurt Schwartz.

The chapter describes wave functions for electron-excess color centers in alkali halides of the NaCl structure.

The importance of color centers in the alkali halides derives not only from their inherent significance, but also from the fact that they are among the simplest defects in some of the simplest by: Alkali metal halides, or alkali halides, are the family of inorganic compounds with the chemical formula MX, where M is an alkali metal and X is a compounds are the often commercially significant sources of these metals and halides.

The best known of these compounds is sodium chloride, table salt. In photography, information is stored in a medium which is essentially two-dimensional.

Three-dimensional optical storage is possible in semitransparent colored materials, like alkali halides with color centers. With the use of coherent light sources, like lasers, large amounts of information can be stored in the volume, and retrieved with little : P.

Van Heerden. Color center formation in alkali-halide crystals under ionizing irradiationhalide crystals under ionizing irradiation LiF:F 2-active element optimization LiF:F 2 + active element optimization 4. Major spectroscopic characteristics of color centers 5. CW d iCW and quasi-CW l t l ti (T 77K)CW color center laser operation (T=77K) Size: 2MB.

Therefore, we can expect that the E′ centers in quartz (not alkali-halide crystals), like the F centers of colored alkali-halide crystals, are attributed to the dislocation exoelectron emission from quartz of granites deformed plastically before and during earthquakes; in this process the frictional heating is a possible heat source.

Formation of high density color centers and laser ablation in alkali halide crystals Article in Journal of Luminescence May with 10 Reads How we measure 'reads'. The U.S. Department of Energy's Office of Scientific and Technical Information.F-centers in alkali halides.

Solid state physics, sup- plement 8. BY JORDAN J. MARKHAM. Pp. x @ New York and London: Academic Press, Price $ First impressions carry considerable weight, and in this case I was struck by the time gap between the literature covered and the present day.This question has been studied extensively in color centers in alkali halides, mainly in the F center, which is a model case for most of the optical centers in other materials.

The results obtained up to now show in the majority of the cases that the processes mentioned above occur after the electronic excitation reaches the relaxed excited : Giuseppe Baldacchini.