The effect of 1.6‐MeV‐electron irradiation on the infrared properties of high‐purity quartz crystals has been studied. The infrared bands assciated with OH−impurities in SiO2crystals are strongly temperature dependent and must be studied at 77 K or below. Prolonged electron irradiation at low temperature suppresses all of the OH−bands, but these bands recover when the crystals are annealed to approximately 740 K. If as‐grown crystals are irradiated at 300 K, the intensity of the OH−bands decreases and two new bands appear at 3367 and 3306 cm−1. The relative absorption intensity of these two bands depends on radiation temperature and dose.
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