Copyright 1998 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics, 83(7), 3583-3594, 1998 and may be found at http://dx.doi.org/10.1063/1.366575
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机译：版权所有1998美国物理研究所。本文只能下载供个人使用。任何其他用途都需要得到作者和美国物理研究所的事先许可。以下文章发表于1998年的《应用物理学杂志》（Journal of Applied Physics）83（7）3583-3594中，并可在http://dx.doi.org/10.1063/1.366575中找到
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