Impurity Effects on the Ionization States of F-aggregate Color Centers in Sodium Fluoride PDF Download
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Author: Ashoka Chandra Publisher: ISBN: Category : Sodium fluoride crystals Languages : en Pages : 442
Book Description
The role of hydroxide and peroxide impurities on color-center properties in sodium fluoride were studied with several crystals grown with the Kyropoulous technique. The optical absorption in peroxide doped samples consists primarily of three bands at 275 millimicrons, 235 millimicrons and 195 millimicrons respectively. The production of F centers is determined almost entirely by impurities with a small contribution due to intrinsic processes. The large coloration in hydroxide and peroxide doped samples are explained on the basis of photochemical reactions involving impurities which act as sources of anion vacancies and electrons. Important differences were observed in hydroxide and peroxide doped samples in relation to the charge state of the aggregate centers. Electron-deficient centers are stabilized and the probability of their formation is enhanced in hydroxide doped samples. In peroxide doped samples the excess electron centers are favored. Several new absorption bands were observed in hydroxide and peroxide doped samples.
Author: Ashoka Chandra Publisher: ISBN: Category : Sodium fluoride crystals Languages : en Pages : 442
Book Description
The role of hydroxide and peroxide impurities on color-center properties in sodium fluoride were studied with several crystals grown with the Kyropoulous technique. The optical absorption in peroxide doped samples consists primarily of three bands at 275 millimicrons, 235 millimicrons and 195 millimicrons respectively. The production of F centers is determined almost entirely by impurities with a small contribution due to intrinsic processes. The large coloration in hydroxide and peroxide doped samples are explained on the basis of photochemical reactions involving impurities which act as sources of anion vacancies and electrons. Important differences were observed in hydroxide and peroxide doped samples in relation to the charge state of the aggregate centers. Electron-deficient centers are stabilized and the probability of their formation is enhanced in hydroxide doped samples. In peroxide doped samples the excess electron centers are favored. Several new absorption bands were observed in hydroxide and peroxide doped samples.
Author: Publisher: ISBN: Category : Nuclear energy Languages : en Pages : 992
Book Description
NSA is a comprehensive collection of international nuclear science and technology literature for the period 1948 through 1976, pre-dating the prestigious INIS database, which began in 1970. NSA existed as a printed product (Volumes 1-33) initially, created by DOE's predecessor, the U.S. Atomic Energy Commission (AEC). NSA includes citations to scientific and technical reports from the AEC, the U.S. Energy Research and Development Administration and its contractors, plus other agencies and international organizations, universities, and industrial and research organizations. References to books, conference proceedings, papers, patents, dissertations, engineering drawings, and journal articles from worldwide sources are also included. Abstracts and full text are provided if available.
Author: Ashoka Chandra
Author: Ashoka Chandra
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