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Optical emissions from oxygen atom reactions with adsorbates

机译：氧原子与被吸附物反应产生的光发射

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Abstract: Although most optical materials are inert to the ambient low earth orbit environment, high velocity oxygen atoms will react with adsorbates to produce optical emissions from the ultraviolet into the infrared. The adsorbates arise from chemical releases or outgassing from the spacecraft itself. We have been investigating kinetic and spectral aspects of these phenomenon by direct observation of the 0.2 to 13 $mu@m chemiluminescence from the interaction of a fast atomic oxygen beam with a continuously dosed surface. The dosing gases include fuels, combustion products and outgassed species such as unsymmetrical dimethylhydrazine (UDMH), NO, H$-2$/O and CO. The surface studied include gold and magnesium fluoride. In order to relate the results to actual spacecraft conditions these phenomena have been explored as a function of O atom velocity, dosant flux and substrate temperature. UDMH dosed surfaces exhibit spectra typical (wavelength and intensity) of carbonaceous surfaces. The primary emitters are CO, CO$-2$/, and OH. H$-2$/O dosed surfaces are dominated by OH and /or H$-2$/O emission while CO dosed surfaces are dominated by CO and CO$-2$/ emissions. The nitric oxide dosed surface produces a glow from 0.4 to 5.4 $mu@m due to NO$-2$/$+*$/ continuum emission. The emission was observed to increase by a factor of two upon cooling the surface from 20$DGR@C to $MIN@35$DGR@C.!11
机译：摘要：尽管大多数光学材料对周围的低地球轨道环境呈惰性，但高速氧原子会与被吸附物发生反应，从而产生从紫外线到红外线的光发射。吸附物来自航天器本身的化学释放或放气。我们一直在研究这些现象的动力学和光谱方面，方法是通过快速原子氧束与连续剂量表面的相互作用直接观察到0.2至13μm的化学发光。计量气体包括燃料，燃烧产物和除气物质，例如不对称二甲基肼（UDMH），NO，H $ -2 $ / O和CO。研究的表面包括金和氟化镁。为了将结果与实际的航天器状况联系起来，已经根据O原子速度，剂量通量和衬底温度对这些现象进行了研究。 UDMH剂量表面显示出碳质表面的典型光谱（波长和强度）。主要排放源为CO，CO $ -2 $ /和OH。 H $ -2 $ / O剂量的表面主要由OH和/或H $ -2 $ / O排放量决定，而CO剂量表面则由CO和CO $ -2 $ /主要排放量。由于连续排放NO $ -2 $ / $ + * $ /，一氧化氮配给的表面会产生0.4至5.4μm的辉光。当将表面从20 $ DGR @ C冷却到$ MIN @ 35 $ DGR @ C时，观察到发射增加了两倍。！11

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