Generation mechanism of photoinduced paramagnetic centers from preexisting precursors in high-purity silicas

Hiroyuki Nishikawa, Ryuta Nakamura, Ryoichi Tohmon, Yoshimichi Ohki, Yuryo Sakurai, Kaya Nagasawa, Yoshimasa Hama

Research output: Contribution to journalArticle

88 Citations (Scopus)

Abstract

High-purity silicas synthesized by various manufacturing methods were studied by electron-spin resonance after being irradiated by ArF excimer laser (6.4 eV) at room temperature. Ee centers (?Si) are induced in all samples, while nonbridging oxygen hole centers (?Si-O) appear only in oxygen-surplus silicas and in a sample which has an absorption band at 5.1 eV. The concentration of Ee centers varies from sample to sample, ranging between 1014 and 1016 spins/cm3 for the exposure at the average power density of 28 mJ/cm2 per pulse at 15 Hz for 1 h. The sample dependence regarding the species and concentrations of photoinduced defects is well explained in terms of transformation of preexisting precursors to paramagnetic defects through a two-photon-absorption process.

Original languageEnglish
Pages (from-to)7828-7834
Number of pages7
JournalPhysical Review B
Volume41
Issue number11
DOIs
Publication statusPublished - 1990
Externally publishedYes

Fingerprint

Silicon Dioxide
purity
Silica
Oxygen
silicon dioxide
Defects
Excimer lasers
Paramagnetic resonance
Absorption spectra
Photons
defects
oxygen
excimer lasers
radiant flux density
electron paramagnetic resonance
manufacturing
Temperature
absorption spectra
photons
room temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Generation mechanism of photoinduced paramagnetic centers from preexisting precursors in high-purity silicas. / Nishikawa, Hiroyuki; Nakamura, Ryuta; Tohmon, Ryoichi; Ohki, Yoshimichi; Sakurai, Yuryo; Nagasawa, Kaya; Hama, Yoshimasa.

In: Physical Review B, Vol. 41, No. 11, 1990, p. 7828-7834.

Research output: Contribution to journalArticle

Nishikawa, Hiroyuki ; Nakamura, Ryuta ; Tohmon, Ryoichi ; Ohki, Yoshimichi ; Sakurai, Yuryo ; Nagasawa, Kaya ; Hama, Yoshimasa. / Generation mechanism of photoinduced paramagnetic centers from preexisting precursors in high-purity silicas. In: Physical Review B. 1990 ; Vol. 41, No. 11. pp. 7828-7834.
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AU - Nagasawa, Kaya

AU - Hama, Yoshimasa

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