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Optical emissions from oxygen atom reactions with adsorbates

机译：来自吸附物的氧原子反应的光学排放

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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.
机译：尽管大多数光学材料是环境低地球轨道环境的惰性，但高速氧原子将与吸附物反应，以产生从紫外线进入红外线的光学排放。吸附剂从化学版本中出现或从航天器本身放出。我们已经通过直接观察来自快速原子氧束的相互作用，从用连续的表面直接观察0.2〜13 $ MU @ M分析，研究了这些现象的动力学和光谱方面。给药气体包括燃料，燃烧产物和除羟氟嗪（UDMH），NO，H $ -2 $ / O和CO。所研究的表面包括金和氟化镁。为了将结果与实际航天器条件相关联，这些现象被探讨为O原子速度，循环通量和基板温度的函数。 UDMH的表面表面表现出碳质表面的典型（波长和强度）。主要发射者是CO，CO $ -2 $ /，哦。 $ -2 $ / o带有oh和/或h $ /或$-$-$-$-$ / o排放，而CO给人表面由CO和CO $ -2 $ /排放主导。由于N $-2 $ / $ + * $ /连续排放，一氧化氮剂量表面产生从0.4到5.4 $ mu @ m的发光。在将表面冷却到25美元@ 35 $ dgr @ c时，观察到从20美元的表面加工到$ min @ 35 $ dgr @ c时增加了两个倍数。

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