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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Temperature effects on the IR absorption bands of hydroxyl and deuteroxyl groups in silica glass
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Temperature effects on the IR absorption bands of hydroxyl and deuteroxyl groups in silica glass

机译：温度对石英玻璃中羟基和氘氧基的红外吸收带的影响

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摘要

In this report we will show the changes of the band shape of the hydroxyl group (SiOH) infrared (IR) absorption band (similar to 3670 cm(-1)) in silica glass induced by lowering temperature in the range from 290 to 20 K. This band is considered as the overlap of several spectral components associated to the vibrational activity of hydroxyl groups in different bond configurations. By a suitable analysis of the experimental band profile in terms of different sub-bands, we studied the thermal evolution of each component and we reconsidered their assignations. For comparison we examined the SiOD absorption band (similar to 2710 cm(-1)) as a function of temperature as well. Our data can be interpreted as an evidence of a conversion process of free into H(D)-bonded SiOH(D) groups. Moreover, we estimated the ratio between the molar extinction coefficients of the two main species involved in this process finding that this ratio is appreciably influenced by the isotopic exchange.
机译：在此报告中，我们将显示由于温度降低了290至20 K而引起的石英玻璃中的羟基（SiOH）红外（IR）吸收带（类似于3670 cm（-1））的能带形状变化该带被认为是与不同键结构中的羟基的振动活性相关的几个光谱成分的重叠。通过对不同子频带下的实验频带分布进行适当的分析，我们研究了每个组件的热演化，并重新考虑了它们的分配。为了进行比较，我们还研究了SiOD吸收带（类似于2710 cm（-1））随温度的变化。我们的数据可以解释为自由转化为H（D）结合的SiOH（D）基团的证据。此外，我们估计了参与该过程的两个主要物种的摩尔消光系数之间的比率，发现该比率受到同位素交换的明显影响。

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