求助。想问一下大家,这块讲的这个A1g和B1g分别指的是什么啊
The Raman spectrum of the sample displays all of the characteristic peaks of anatase TiO2, including the signals at 636 and 142 cm-1, assigned to the Eg mode; the signal at 516 cm-1, assigned to the doublet of A1g and B1g modes; and the signal at 395 cm-1, assigned to the B1g mode.
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