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Self-supporting CVD diamond charge state conversion surfaces for high resolution imaging of low-energy neutral atoms in space plasmas

机译:自支撑CVD金刚石电荷状态转换表面,用于对空间等离子体中的低能量中性原子进行高分辨率成像

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摘要

Two polycrystalline diamond surfaces, manufactured by chemical vapour deposition (CVD) technique, are investigated regarding their applicability as charge state conversion surfaces (CS) for use in a low energy neutral atom imaging instrument in space research. The capability of the surfaces for converting neutral atoms into negative ions via surface ionisation processes was measured for hydrogen and oxygen with particle energies in the range from 100 eV to 1 keV and for angles of incidence between 6 deg and 15 deg. We observed surface charging during the surface ionisation processes for one of the CVD samples due to low electrical conductivity of the material. Measurements on the other CVD diamond sample resulted in ionisation efficiencies of ~2 % for H and up to 12 % for O. Analysis of the angular scattering revealed very narrow and almost circular scattering distributions. Comparison of the results with the data of the CS of the IBEX-Lo sensor shows that CVD diamond has great potential as CS material for future space missions.
机译:研究了通过化学气相沉积(CVD)技术制造的两个多晶金刚石表面在空间研究中作为低能中性原子成像仪器中电荷状态转换表面(CS)的适用性。测量了表面和氢通过分子能在100 eV到1 keV之间的能量和在6度到15度之间的入射角通过氢离子和氧离子将表面原子转化为负离子的能力。由于材料的低电导率,我们在其中一个CVD样品的表面电离过程中观察到了表面电荷。在其他CVD金刚石样品上进行的测量导致H的电离效率约为2%,O的电离效率高达12%。对角散射的分析显示,散射分布非常狭窄,几乎呈圆形。将结果与IBEX-Lo传感器的CS数据进行比较,结果表明CVD金刚石具有巨大的潜力,可以用作未来太空任务的CS材料。

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