Enhanced photogeneration of E′ centers from neutral oxygen vacancies in the presence of hydrogen in high-purity silica glass

Hiroyuki Nishikawa, Ryuta Nakamura, Yoshimichi Ohki, Yoshimasa Hama

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Electron-spin-resonance (ESR) and ultraviolet-vacuum-ultraviolet (uv-vuv) spectra were measured on two types of oxygen-deficient silicas, i.e., low-OH ([OH]<1 ppm) and high-OH ([OH]20 ppm) silicas, and a high-OH ([OH]1000 ppm) stoichiometric silica. The results of ESR show that the E′ concentration induced in an OH-containing oxygen-deficient silica is one or two orders of magnitude higher than in low-OH oxygen-deficient and high-OH stoichiometric silicas when exposed to 6.4-eV or 7.9-eV photons. It is shown from the vuv spectra that the conversion of an oxygen vacancy into an E′ center is enhanced in the OH-containing oxygen-deficient silica compared with the low-OH oxygen-deficient silica. The conversion into an E′ center is considered to be mediated by diffusion of atomic hydrogen released from the Si-H bond. A slight peak shift of the 5.8-eV absorption band due to the E′ center suggests that the formation of an Eβ′-like center is involved in the enhanced E′ creation. A possible correlation of the enhanced E′ creation with the appearance of a 7.4-mT doublet in the ESR spectrum is also discussed.

Original languageEnglish
Pages (from-to)2968-2973
Number of pages6
JournalPhysical Review B
Volume48
Issue number5
DOIs
Publication statusPublished - 1993
Externally publishedYes

Fingerprint

silica glass
Oxygen vacancies
Fused silica
Silicon Dioxide
Hydrogen
purity
Silica
silicon dioxide
oxygen
hydrogen
Oxygen
Paramagnetic resonance
electron paramagnetic resonance
ultraviolet spectra
Absorption spectra
Photons
Vacuum
absorption spectra
vacuum
shift

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Enhanced photogeneration of E′ centers from neutral oxygen vacancies in the presence of hydrogen in high-purity silica glass. / Nishikawa, Hiroyuki; Nakamura, Ryuta; Ohki, Yoshimichi; Hama, Yoshimasa.

In: Physical Review B, Vol. 48, No. 5, 1993, p. 2968-2973.

Research output: Contribution to journalArticle

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