荧光光谱振动结构区分？

如图，激发光谱曲线和发射光谱曲线均标注了1300 cm-1，如下是文献中对该图出现的1300 cm-1，最直接的描述。

The butyronitrile glass of complexes 1-5 upon excitation at λ > 350 nm
show well-resolved vibronic structured emissions at 510-580 nm with
progressional spacings of ca. 1300 cm-1, which correspond to the aromatic
vibrational mode of the terpyridine ligands.

我想问：这个数值是如何计算的？


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