暴露于实验室模拟的宇宙射线的天体物理学冰的红外复合物refractive index
Infrared complex refractive index of astrophysical ices exposed to cosmic rays simulated in the laboratory
摘要：
在星际介质（ISM）的稠密和寒冷区域，分子可能被吸附在尘埃颗粒上形成冰幔。一旦形成，它们可以被来自恒星或星际介质的电离辐射处理，导致在冰中形成几个新的分子。在众多的电离辐射中，宇宙射线由于在冰中沉积了大量的能量，在固态化学中起着重要的作用。由天体物理冰的高能处理引起的物理化学变化记录在物质的一个称为复折射率（CRI）的内在参数中。本文首次给出了在实验室中用宇宙线模拟处理的13种不同含水冰在2.0 - 16.6微米红外波段的39个复折射率（n，k）的星表。通过使用NKABS（从吸收数据确定N和K的首字母缩略词）代码进行计算，该代码采用Lambert-Beer和Kramers-Kronig方程来计算n和k的值。结果也可在网站上查阅：http://www1.univap.br/gaa/nkabs-database/data.htm。作为测试案例，H2O：NH3：CO2：CH 4冰被用于原行星盘的辐射转移模拟，以表明这些数据对于再现含冰的YSO光谱是必不可少的。
英文摘要：
In dense and cold regions of the interstellar medium (ISM), molecules may be adsorbed onto dust grains to form the ice mantles. Once formed, they can be processed by ionizing radiation coming from stellar or interstellar medium leading to formation of several new molecules in the ice. Among the different kind of ionizing radiation, cosmic rays play an important role in the solid-phase chemistry because of the large amount of energy deposited in the ices. The physicochemical changes induced by the energetic processing of astrophysical ices are recorded in a intrinsic parameter of the matter called complex refractive index (CRI). In this paper, we present for the first time a catalogue containing 39 complex refractive indices (n, k) in the infrared from 2.0 - 16.6 micrometer for 13 different water-containing ices processed in laboratory by cosmic ray analogs. The calculation was done by using the NKABS (acronym of determination of N and K from ABSorbance data) code, which employs the Lambert-Beer and Kramers-Kronig equations to calculate the values of n and k. The results are also available at the website: http://www1.univap.br/gaa/nkabs-database/data.htm. As test case, a H2O:NH3:CO2:CH4 ice was employed in a radiative transfer simulation of a prototoplanetary disk to show that these data are indispensable to reproduce the spectrum of YSOs containing ices.
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