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[交流] 【求助】关于石墨结构的问题

本人是做拉曼光谱的,最近在一篇英文文献上看到石墨结构方面的内容,不是很能理解,希望有高手能帮我解答一下。

The Raman spectrum of single hexagonal crystal graphite (space group D4 6h presents a main first order E 2g2 band at 1582cm-1 with weaker bands at 42
(E2g1) and 2724 cm-1. The mode at 1582 cm-1, often referred as the G mode, is assigned to ‘in plane’ displacement of the carbons strongly coupled in the hexagonal sheets.

这段内容里面说G模式指认为是‘in plane’ displacement of the carbons strongly coupled in the hexagonal sheets,是指什么结构的振动模式?看不太明白啊,请高人给详细解释一下吧
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