PAH

• PAH 的辐射

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]

• PAHFIT