Ag atom is heavier than Zn atom ,therefore according to the well established theories of irrational modes in mixed crystals the substitution should result in a
downward shift of the fundamental transverse optical phonon mode.
按谷歌翻译，theories of irrational modes译为非理性模式理论，但是搜这个理论中文名字木有找到！我觉得翻译有问题，有虫友知道这种理论吗？
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