25年后的PAH假说
The PAH hypothesis after 25 years
摘要：
许多银河系和河外天体的红外光谱主要由3.3、6.2、7.7、8.6和11.2 μm的发射特征所支配。近十年来，这些特征的载体仍然是一个谜，因此这些波段被称为未识别红外（UIR）波段。自80年代中期以来，UIR谱带通常归因于多环芳烃分子（PAH）吸收紫外光子后的IR荧光-PAH假说。在这里，我们回顾了在过去的25年中所取得的进展，在了解UIR波段及其载波。
英文摘要：
The infrared spectra of many galactic and extragalactic objects are dominated by emission features at 3.3, 6.2, 7.7, 8.6 and 11.2 μm. The carriers of these features remained a mystery for almost a decade, hence the bands were dubbed the unidentified infrared (UIR) bands. Since the mid-80's, the UIR bands are generally attributed to the IR fluorescence of Polycyclic Aromatic Hydrocarbon molecules (PAHs) upon absorption of UV photons -- the PAH hypothesis. Here we review the progress made over the past 25 years in understanding the UIR bands and their carriers.
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