中型多环芳烃的电子spectroscopy：对2175 π UV碰撞载流子的影响
Electronic spectroscopy of medium-sized polycyclic aromatic hydrocarbons: Implications for the carriers of the 2175 Å UV bump
摘要：
利用激光热解技术制备了多环芳烃混合物。提取的多环芳烃的主要部分主要是中等大小的，最大尺寸为38个碳原子每分子。使用不同的提取溶剂和随后的色谱分离提供了不同大小分布的混合物。通过基质隔离光谱法在低温下测量了紫外-可见吸收光谱，并在室温下测量了透明基底上膜状沉积物中多环芳烃的紫外-可见吸收光谱。根据半经验计算，我们的研究结果表明，每个分子具有约50至60个碳原子的大型多环芳烃可能是217.5 nm处星际紫外线碰撞的原因。
英文摘要：
Mixtures of polycylic aromatic hydrocarbons (PAHs) have been produced by means of laser pyrolysis. The main fraction of the extracted PAHs were primarily medium-sized, up to a maximum size of 38 carbon atoms per molecule. The use of different extraction solvents and subsequent chromatographic fractionation provided mixtures of different size distributions. UV-VIS absorption spectra have been measured at low temperature by matrix isolation spectroscopy and at room temperature with PAHs as film-like deposits on transparent substrates. In accordance with semi-empirical calculations, our findings suggest that large PAHs with sizes around 50 to 60 carbon atoms per molecule could be responsible for the interstellar UV bump at 217.5 nm.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
