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Nano-scale radiation effects in wide-gap crystals under irradiation by VUV photons

Lushchik, A; Kirm, M; Lushchik, C; Martinson, Indrek LU ; Nagirnyi, V and Vasil'chenko, E (2002) In Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms 191(1-4). p.135-143
Abstract
The creation spectra of F centres by synchrotron radiation of 5-35 eV have been measured for Na6Al6Si6O24(NaI)(2x) and Na6Al6Si6O24(NaBr)(2x) optical ceramics at 8 and 80 K. The exciting photons cause the excitation and ionization of halogen ions (6-8 eV) and of an aluminosilicate carcass (8.5-31 eV) or the excitation of Na+ ions (32-35 eV). An exciting photon of 20-26 and 27-31 eV creates two or three electron-hole pairs, respectively. Besides the electron-hole creation mechanism of F centres with the participation of pre-irradiation defects, the basic interstitial-vacancy creation mechanism of Frenkel defect pairs is realized in socialites at high doses of irradiation at 300 K. A Br-0 atom formed at the irradiation in a regular beta-cage... (More)
The creation spectra of F centres by synchrotron radiation of 5-35 eV have been measured for Na6Al6Si6O24(NaI)(2x) and Na6Al6Si6O24(NaBr)(2x) optical ceramics at 8 and 80 K. The exciting photons cause the excitation and ionization of halogen ions (6-8 eV) and of an aluminosilicate carcass (8.5-31 eV) or the excitation of Na+ ions (32-35 eV). An exciting photon of 20-26 and 27-31 eV creates two or three electron-hole pairs, respectively. Besides the electron-hole creation mechanism of F centres with the participation of pre-irradiation defects, the basic interstitial-vacancy creation mechanism of Frenkel defect pairs is realized in socialites at high doses of irradiation at 300 K. A Br-0 atom formed at the irradiation in a regular beta-cage can penetrate into a neighbouring cage. As a result, an F centre and a Br-2(-) molecule (H centre) are formed and the interdefect distance in this pair is about I nm. The efficiency of F-H pair creation is especially high under the conditions of multiplication of electron-hole pairs. In contrast to alkali halides the crowdion configuration of interstitials does not exist in sodalites and F-H pairs are stable up to 450 K. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
multiplication of excitations, sodalites, pairs of Frenkel defects, alkali halides
in
Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
volume
191
issue
1-4
pages
135 - 143
publisher
Elsevier
external identifiers
  • wos:000176692300025
  • scopus:0036574478
ISSN
0168-583X
DOI
10.1016/S0168-583X(02)00531-1
language
English
LU publication?
yes
id
b6f086fd-c447-47e1-be75-8395f54b2c4a (old id 333636)
date added to LUP
2007-11-02 10:40:31
date last changed
2017-01-01 06:42:48
@article{b6f086fd-c447-47e1-be75-8395f54b2c4a,
  abstract     = {The creation spectra of F centres by synchrotron radiation of 5-35 eV have been measured for Na6Al6Si6O24(NaI)(2x) and Na6Al6Si6O24(NaBr)(2x) optical ceramics at 8 and 80 K. The exciting photons cause the excitation and ionization of halogen ions (6-8 eV) and of an aluminosilicate carcass (8.5-31 eV) or the excitation of Na+ ions (32-35 eV). An exciting photon of 20-26 and 27-31 eV creates two or three electron-hole pairs, respectively. Besides the electron-hole creation mechanism of F centres with the participation of pre-irradiation defects, the basic interstitial-vacancy creation mechanism of Frenkel defect pairs is realized in socialites at high doses of irradiation at 300 K. A Br-0 atom formed at the irradiation in a regular beta-cage can penetrate into a neighbouring cage. As a result, an F centre and a Br-2(-) molecule (H centre) are formed and the interdefect distance in this pair is about I nm. The efficiency of F-H pair creation is especially high under the conditions of multiplication of electron-hole pairs. In contrast to alkali halides the crowdion configuration of interstitials does not exist in sodalites and F-H pairs are stable up to 450 K.},
  author       = {Lushchik, A and Kirm, M and Lushchik, C and Martinson, Indrek and Nagirnyi, V and Vasil'chenko, E},
  issn         = {0168-583X},
  keyword      = {multiplication of excitations,sodalites,pairs of Frenkel defects,alkali halides},
  language     = {eng},
  number       = {1-4},
  pages        = {135--143},
  publisher    = {Elsevier},
  series       = {Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms},
  title        = {Nano-scale radiation effects in wide-gap crystals under irradiation by VUV photons},
  url          = {http://dx.doi.org/10.1016/S0168-583X(02)00531-1},
  volume       = {191},
  year         = {2002},
}