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[求助] Raman

在文献上看到用拉曼计算微晶尺寸的方法,但是不知道C是什么?请求各位大神帮忙,急急急!!1
The seminal paper studying disorder in graphitic samples
is that of Tuinstra and Koening (TK) [26]. They noted that
the ratio of the D peak intensity to that of the G peak varied
inversely with La:
I (D)/I (G)= C(λ)/La
where C (488 nm) ~ 4.4 nm from Refs. [26,91,92,44]. There
are few experimental verifications of TK where La is known
independently by X-ray diffraction (XRD) [26,93–97], and the
minimum La for which TK has been directly verified is ~2 nm.
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