Wdowiak T J, Flickinger G C, Cronin J R
Physics Department, University of Alabama at Birmingham, USA.
Astrophys J. 1988 May 15;328(2):L75-9. doi: 10.1086/185163.
Deuterium abundance measurements and the 13C NMR spectrum of the HF/HCl insoluble residue of the Orgueil carbonaceous chondrite indicate the presence of an extensive component of polycyclic aromatic hydrocarbons (PAH) that is of possible interstellar origin or is similar to PAH hypothesized to exist in interstellar space. Infrared spectra have been obtained using an FTIR spectrometer of the acid insoluble residue, the residue after heating in vacuum, and condensate. Bulk acid insoluble residue was pressed into KBr pellets and also heated under high vacuum to sublimate a volatile component onto KBr disks. The remaining non-volatile organic component of the Orgueil meteorite from such evaporations pressed into KBr pellets exhibits a spectral signature similar to that observed in emission from the Orion Nebula and found in Raman spectra of interplanetary dust particles (IDPs). In addition it has an 11.3 microns (885 cm-1) band indicating PAH having single hydrogens per peripheral aromatic ring. We conclude the nonvolatile material is similar to interstellar PAH because the observed 11.3 microns (885 cm-1) unidentified infrared (UIR) emission suggests interstellar PAH have single hydrogens per peripheral aromatic ring. The volatile fraction of the Orgueil shows an aliphatic CH stretch feature and its spectrum in the 2-25 microns range is similar to that of the bulk residue.
对奥盖尔碳质球粒陨石的HF/HCl不溶残渣进行的氘丰度测量和13C核磁共振光谱表明，存在大量多环芳烃（PAH）成分，其可能起源于星际空间，或者类似于假设存在于星际空间中的PAH。使用傅里叶变换红外光谱仪（FTIR）获得了酸不溶残渣、真空加热后的残渣以及冷凝物的红外光谱。将大量酸不溶残渣压制成KBr片，并在高真空下加热，使挥发性成分升华到KBr盘上。通过这种蒸发得到的奥盖尔陨石剩余非挥发性有机成分被压制成KBr片，其光谱特征与在猎户座星云发射中观察到的以及在行星际尘埃颗粒（IDP）拉曼光谱中发现的相似。此外，它有一个11.3微米（885厘米-1）的波段，表明PAH每个外围芳香环有单个氢原子。我们得出结论，非挥发性物质类似于星际PAH，因为观察到的11.3微米（885厘米-1）未识别红外（UIR）发射表明星际PAH每个外围芳香环有单个氢原子。奥盖尔陨石的挥发性部分显示出脂肪族CH伸缩特征，其在2 - 25微米范围内的光谱与大量残渣的光谱相似。
