Measurements of visible and near-infrared reflection (0.38–5 μm) and mid-to-far-infrared emission (5–200 μm) from telescope and satellite remote-sensing instruments make it possible to investigate the composition of planetary surfaces via electronic transitions and vibrational modes of chemical bonds. Red spectral slopes at visible and near-infrared wavelengths and absorption features at 3.3 and 3.4 μm observed in circumstellar disks, in the interstellar medium (ISM), and on the surfaces of solar system bodies are interpreted to be due to the presence of organic material and other carbon compounds. Identifying the origin of these features requires measurements of the optical properties of a variety of relevant analog and planetary materials. Spectroscopic models of dust within circumstellar disks and the ISM, as well as planetary regoliths, often incorporate just one such laboratory measurement despite the wide variation in absorption and extinction properties of organic and other carbon-bearing materials. Here we present laboratory measurements of transmission spectra in the 1.5–13 μm region and use these to derive real and imaginary indices of refraction for two samples: (1) an analog to meteoritic insoluble organic matter and (2) a powdered Allende meteorite sample. We also test our refractive index retrieval method on a previously published transmission spectrum of an Mg-rich olivine. We compare optical measurements of the insoluble organic matter analog to those of other solar system and extrasolar organic analogs, such as amorphous carbon and tholins, and find that the indices of refraction of the newly characterized material differ significantly from other carbonaceous samples.

来自望远镜和卫星遥感仪器的可见光和近红外反射 (0.38-5 μ m) 和中远红外发射 (5-200 μ m) 的测量使得通过以下方式研究行星表面的成分成为可能化学键的电子跃迁和振动模式。可见光和近红外波长处的红色光谱斜率以及 3.3 和 3.4 μ处的吸收特征在星周盘、星际介质 (ISM) 和太阳系天体表面观察到的 m 被解释为由于有机材料和其他碳化合物的存在。确定这些特征的起源需要测量各种相关模拟和行星材料的光学特性。尽管有机和其他含碳材料的吸收和消光特性差异很大，但星周盘和 ISM 以及行星风化层内的尘埃光谱模型通常只包含一种这样的实验室测量。在这里，我们展示了 1.5-13 μ 范围内透射光谱的实验室测量结果m 区域并使用这些来推导出两个样品的实部和虚部折射率：(1) 陨石不溶性有机物的类似物和 (2) 阿连德陨石粉样品。我们还在先前发布的富含镁橄榄石的透射光谱上测试了我们的折射率检索方法。我们将不溶性有机物质类似物的光学测量与其他太阳系和太阳系外有机类似物（如无定形碳和托林）的光学测量值进行比较，发现新表征的材料的折射率与其他碳质样品显着不同。