Gamma-ray induced 2 ev band appears at different wavelengths depending on the OH-group content. It is found that 2 ev band formed in low-OH content fibers, formerly ascribed to another precursor, is caused by non-bridging oxygen hole centers (NBOHC) as is the one formed in high-OH content fibers. The differences in peak wavelength and in oscillator strength are responsible for hydrogen bonding between NBOHC and a nearly OH-group. The NBOHC with a hydrogen bond in the shape formed more in high-OH content fibers absorbs light around 600 nm, while it absorbs around 630 nm when it exists without forming a hydrogen bond.
|Title of host publication||Japanese Journal of Applied Physics, Part 2: Letters|
|Publication status||Published - 1987 Jun|
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