PAH
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- 3.3um C-H键震动，脂肪族的C-H键震动在3.4um
- 6.2,7.6um是C-C拉伸震动
- 7.8,8.6 C-H在平面内弯曲，11.3,12.7平面外弯曲
- 17um,C-C-C弯曲，18mu有硅的发射特征
- PAHs are better suited as a tracer of B stars than as a tracer of massive SF. They probe star formation activity time scales of up to 100Myr. [1]