Spectroscopy of large PAHs Laboratory studies and comparison to the Diffuse Interstellar Bands
Spectroscopy of large PAHs Laboratory studies and comparison to the Diffuse Interstellar Bands
复制标题
大型 PAH 的光谱实验室研究以及与漫射星际带的比较
DOI：
10.1051/0004-6361:20020478
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发表时间：
2002
影响因子：
6.5
通讯作者：
P. Ehrenfreund
中科院分区：
文献类型：
--
作者：
R. Ruiterkamp;T. M. Halasinski;Farid Salama;B. Foing;L. Allamandola;W. Schmidt;P. Ehrenfreund
多环芳烃（PAHs）被认为是无处不在的红外发射带（UIB）的载体。来自红外空间天文台（ISO）的数据为星际多环芳烃分子的尺寸分布和结构提供了新的见解，指出了更大尺寸的多环芳烃的趋势。银河系和河外源的中红外光谱也表明存在5-环结构和带有侧基的PAH结构。本文首次报道了实验室测量的紫外-可见-近红外吸收光谱的一组代表性的大的多环芳烃，也已被选定为一个长期的曝光实验在国际空间站国际空间站。多环芳烃的大小高达600 amu，包括5-环物种和多环芳烃含有杂原子，已被合成，并使用基质分离光谱测量其光谱。在这项工作中测量的中性物质和相关的阳离子和阴离子的光谱进行了比较，天文光谱的Diuse星际带（DIBs）。
Polycyclic Aromatic Hydrocarbons (PAHs) are thought to be the carriers of the ubiquitous infrared emission bands (UIBs). Data from the Infrared Space Observatory (ISO) have provided new insights into the size distribution and the structure of interstellar PAH molecules pointing to a trend towards larger-size PAHs. The mid-infrared spectra of galactic and extragalactic sources have also indicated the presence of 5-ring structures and PAH structures with attached side groups. This paper reports for the first time the laboratory measurement of the UV-Vis-NIR absorption spectra of a representative set of large PAHs that have also been selected for a long duration exposure experiment on the International Space Station ISS. PAHs with sizes up to 600 amu, including 5-ring species and PAHs containing heteroatoms, have been synthesized and their spectra measured using matrix isolation spectroscopy. The spectra of the neutral species and the associated cations and anions measured in this work are also compared to astronomical spectra of Diuse Interstellar Bands (DIBs).