质子化PANH分子的电子光谱
The electronic spectra of protonated PANH molecules
摘要：
目的。本研究的目的是研究质子化氮取代的多环芳烃（H+PANHs）作为扩散星际带（DIBs）的载体的候选人的可行性。方法.我们得到了两个质子化PANH阳离子，质子化吖啶和菲啶，使用母离子光碎片光谱和从头计算产生的理论电子光谱的电子光谱。结果我们表明，这里研究的两个物种的光谱不对应于已知的DIBs。然而，基于这些小的质子化氮取代的多环芳烃的光谱的一般性质，我们建议，较大的H+PANH阳离子代表DIB载体的良好候选人，由于其电子跃迁在紫外可见光和窄光谱带的预期位置。
英文摘要：
Aims. This study was designed to examine the viability of protonated nitrogen-substituted polycyclic aromatic hydrocarbons (H+PANHs) as candidates for the carriers of the diffuse interstellar bands (DIBs). Methods. We obtained the electronic spectra of two protonated PANH cations, protonated acridine and phenanthridine, using parent ion photo-fragment spectroscopy and generated theoretical electronic spectra using ab initio calculations. Results. We show that the spectra of the two species studied here do not correspond to known DIBs. However, based on the general properties derived from the spectra of these small protonated nitrogen-substituted PAHs, we propose that larger H+PANH cations represent good candidates for DIB carriers due to the expected positions of their electronic transitions in the UV-visible and their narrow spectral bands.
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