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<p>This paper investigates the annealing of high-purity synthetic quartz glass at 250°C and an elevated pressure of 7 MPa in a molecular hydrogen atmosphere. The treatment increased transmittance at 190 nm by 2%. Absorption within the 238–254 nm range is attributed to electronic transitions of non-bridging oxygen hole centers (NBOHCs). These centers are passivated by atomic hydrogen, which forms stable Si–OH groups and consequently reduces absorption in the target spectral region. The formation of a characteristic absorption band at 4200–4100 cm<sup>–1</sup>, corresponding to molecular hydrogen dissolved in the quartz glass network, was confirmed by Fourier-transform infrared (FTIR) spectroscopy.</p>

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Optical Properties of High-Purity Synthetic Quartz Glass After Molecular Hydrogen Loading

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • A. V. Fofanov,
  • D. V. Pyankov,
  • K. N. Generalova,
  • M. A. Naparin,
  • N. A. Medvedeva,
  • M. I. Bulatov

摘要

This paper investigates the annealing of high-purity synthetic quartz glass at 250°C and an elevated pressure of 7 MPa in a molecular hydrogen atmosphere. The treatment increased transmittance at 190 nm by 2%. Absorption within the 238–254 nm range is attributed to electronic transitions of non-bridging oxygen hole centers (NBOHCs). These centers are passivated by atomic hydrogen, which forms stable Si–OH groups and consequently reduces absorption in the target spectral region. The formation of a characteristic absorption band at 4200–4100 cm–1, corresponding to molecular hydrogen dissolved in the quartz glass network, was confirmed by Fourier-transform infrared (FTIR) spectroscopy.