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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 >Comment on 'Post UV irradiation annealing of E ' centers in silica controlled by H-2 diffusion' by M. Cannas et al. [J. Non-Cryst. Solids 337 (2004) 9-14]
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Comment on 'Post UV irradiation annealing of E ' centers in silica controlled by H-2 diffusion' by M. Cannas et al. [J. Non-Cryst. Solids 337 (2004) 9-14]

机译：M. Cannas等人对“ H 2扩散控制的二氧化硅中E中心的紫外线照射后退火”的评论。 [J.非Cryst。固体337（2004年）9-14]

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摘要

In the paper by Cannas et al. [M. Cannas, S. Costa, R. Boscaino, F.M. Gelardi, J. Non-Cryst. Solids 337 (2004) 9] the simplest version of the Waite theory of diffusion limited reactions was applied to the post irradiation annealing of E' centers by molecular hydrogen diffusing in a silica matrix. This version of the Waite theory does not take into account limitations arising from the rate of the chemical process between reactants but assumes that the annealing kinetics is limited by the diffusion only. An attempt to fit the annealing rate determined experimentally to that calculated from this version of the Waite theory led to an unrealistically small value of the capture radius. To clarify this issue, a more advanced version of the Waite theory, which takes into account the viability of the chemical reaction between H2 and E' centers, should be used. In this comment such a version of the Waite theory is outlined and applied to an interpretation of the experimental data reported in [M. Cannas, S. Costa, R. Boscaino, F.M. Gelardi, J. Non-Cryst. Solids 337 (2004) 9]. A rigorous argument of the hypothesis introduced in paper [M. Cannas, S. Costa, R. Boscaino, F.M. Gelardi, J. Non-Cryst. Solids 337 (2004) 9] that the annealing kinetics of E' centers is not limited by the diffusion of H2 molecules but is defined by the rate of the chemical reaction itself is presented. (c) 2006 Elsevier B.V. All rights reserved.
机译：在Cannas等人的论文中。 [M. Cannas，S.Costa，R.Boscaino，F.M。 Gelardi，J.Non-Cryst。 [Solids 337（2004）9]]将扩散限制反应的怀特理论的最简单形式应用于通过分子氢在二氧化硅基质中扩散的E'中心的辐照后退火。韦特理论的这种形式没有考虑到反应物之间化学过程的速率所引起的限制，而是假设退火动力学仅受扩散限制。尝试使实验确定的退火速率适合于根据该版本的Waite理论计算出的退火速率，导致捕获半径的值不切实际地小。为了澄清这个问题，应该使用怀特理论的更高级版本，其中考虑了H2和E'中心之间化学反应的可行性。在这篇评论中，概述了韦特理论的这种版本，并将其应用于对[M. Cannas，S.Costa，R.Boscaino，F.M。 Gelardi，J.Non-Cryst。 Solids 337（2004）9]。对论文提出的假设的严格论证[M. Cannas，S.Costa，R.Boscaino，F.M。 Gelardi，J.Non-Cryst。固体337（2004）9]提出了E'中心的退火动力学不受H 2分子的扩散限制，而是由化学反应本身的速率定义。 （c）2006 Elsevier B.V.保留所有权利。

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