表面科学研究二氧化碳在天体冰中的作用。
Surface science investigations of the role of CO₂ in astrophysical ices.
机构信息
Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
出版信息
Philos Trans A Math Phys Eng Sci. 2013 Jun 3;371(1994):20110578. doi: 10.1098/rsta.2011.0578. Print 2013 Jul 13.
We have recorded reflection-absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD) data for a range of CO₂-bearing model astrophysical ices adsorbed on a graphitic dust grain analogue surface. Data have been recorded for pure CO₂, for CO₂ adsorbed on top of amorphous solid water, for mixed CO₂:H₂O ices and for CO₂ adsorbed on top of a mixed CH₃OH:H₂O ice. For the TPD data, kinetic parameters for desorption have been determined, and the trapping behaviour of the CO₂ in the H₂O (CH₃OH) ice has been determined. Data of these types are important as they can be used to model desorption in a range of astrophysical environments. RAIR spectra have also shown the interaction of the CO₂ with H₂O and CH₃OH and can be used to compare with astronomical observations, allowing the accurate assignment of spectra.
我们记录了一系列含有二氧化碳的模型天体冰在石墨尘埃颗粒模拟表面上吸附的反射吸收红外光谱（RAIRS）和程序升温脱附（TPD）数据。这些数据记录了纯二氧化碳、在非晶态水顶层吸附的二氧化碳、混合 CO₂:H₂O 冰以及在混合 CH₃OH:H₂O 冰顶层吸附的二氧化碳。对于 TPD 数据，我们确定了脱附的动力学参数，并确定了 CO₂在 H₂O（CH₃OH）冰中的捕获行为。这些类型的数据非常重要，因为它们可用于模拟一系列天体物理环境中的脱附过程。RAIR 光谱还显示了 CO₂与 H₂O 和 CH₃OH 的相互作用，可用于与天文观测进行比较，从而准确地分配光谱。
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