You need JavaScript to view this

Formation and evolution of point defects created in alkali halogen compounds irradiated by heavy ions; Formation et evolution des defauts ponctuels crees dans certains halogenures alcalins irradies par des ions lourds

Abstract

The goal of this study was to achieve a better understanding of the heavy-ion material interaction. Alkali halogen crystals were chosen since the color centers produced by heavy ions can be distinguished easier from those generated by X rays. Measurements on KI irradiated at low temperature showed that the usual process of non radiative de-excitation of self-captured exciton is not prevailing. As the main objective of this work was the exact determination of the defects created by accelerated heavy ions, an important effort was dedicated to the spectrum deconvolution. Due to the high quality of the obtained spectra the V band analyse was possible. The defect stability was found to have the same nature in all the cubical alkali halogens and depend essentially on the crystal type. The defect evolution after irradiation is related to the diffusion coefficients corresponding to each mobile species and to the crystal lattice in which they move. Based on measurements made at different temperatures a simple modeling of the recombination kinetics was proposed. This effect was found to be specific to irradiation by heavy ions. It is difficult to determine the initial processes from the fossil defects, so, the defect history must be known as  More>>
Authors:
Hourdequin, E [1] 
  1. Nantes Univ., 44 (France)
Publication Date:
Jul 16, 1993
Product Type:
Thesis/Dissertation
Report Number:
FRNC-TH-4074
Reference Number:
SCA: 665300; PA: AIX-29:040005; EDB-98:085209; SN: 98001989036
Resource Relation:
Other Information: DN: 60 refs.; TH: Theses (Ph.D); PBD: 16 Jul 1993
Subject:
66 PHYSICS; CESIUM BROMIDES; CRYSTALS; F CENTERS; HEAVY IONS; ION BEAMS; IRRADIATION; IRRADIATION DEVICES; OPTICAL PROPERTIES; POTASSIUM BROMIDES; POTASSIUM IODIDES; RUBIDIUM BROMIDES; RUBIDIUM IODIDES; TEMPERATURE DEPENDENCE; V CENTERS
OSTI ID:
659905
Research Organizations:
Nantes Univ., 44 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE98629718; TRN: FR9810020040005
Availability:
INIS; OSTI as DE98629718
Submitting Site:
FRN
Size:
147 p.
Announcement Date:
Aug 27, 1998

Citation Formats

Hourdequin, E. Formation and evolution of point defects created in alkali halogen compounds irradiated by heavy ions; Formation et evolution des defauts ponctuels crees dans certains halogenures alcalins irradies par des ions lourds. France: N. p., 1993. Web.
Hourdequin, E. Formation and evolution of point defects created in alkali halogen compounds irradiated by heavy ions; Formation et evolution des defauts ponctuels crees dans certains halogenures alcalins irradies par des ions lourds. France.
Hourdequin, E. 1993. "Formation and evolution of point defects created in alkali halogen compounds irradiated by heavy ions; Formation et evolution des defauts ponctuels crees dans certains halogenures alcalins irradies par des ions lourds." France.
@misc{etde_659905,
title = {Formation and evolution of point defects created in alkali halogen compounds irradiated by heavy ions; Formation et evolution des defauts ponctuels crees dans certains halogenures alcalins irradies par des ions lourds}
author = {Hourdequin, E}
abstractNote = {The goal of this study was to achieve a better understanding of the heavy-ion material interaction. Alkali halogen crystals were chosen since the color centers produced by heavy ions can be distinguished easier from those generated by X rays. Measurements on KI irradiated at low temperature showed that the usual process of non radiative de-excitation of self-captured exciton is not prevailing. As the main objective of this work was the exact determination of the defects created by accelerated heavy ions, an important effort was dedicated to the spectrum deconvolution. Due to the high quality of the obtained spectra the V band analyse was possible. The defect stability was found to have the same nature in all the cubical alkali halogens and depend essentially on the crystal type. The defect evolution after irradiation is related to the diffusion coefficients corresponding to each mobile species and to the crystal lattice in which they move. Based on measurements made at different temperatures a simple modeling of the recombination kinetics was proposed. This effect was found to be specific to irradiation by heavy ions. It is difficult to determine the initial processes from the fossil defects, so, the defect history must be known as the described investigation methods do not permit to establish the transient aspect of defect creation. The important role of impurities should be stressed as the third intruder in the ion/crystal configuration; it can modify significantly the final state of the irradiated crystal, as it was found in KI, for instance. The open problems underlined in this study will probably be solved by using the atomic force microscopy and diffraction or on-line Raman measurements in ISOC chamber to avoid the passage to ambient conditions of the crystals irradiated at low temperatures 60 refs.}
place = {France}
year = {1993}
month = {Jul}
}