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Study of bound hydrogen in powders of diamond nanoparticles

机译：金刚石纳米粒子粉末中结合氢的研究

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In order to access feasibility of increasing albedo of very cold neutrons from powder of diamond nanoparticles, we studied hydrogen bound to surface of diamond nanoparticles, which causes unwanted losses of neutrons. We showed that one could decrease a fraction of hydrogen atoms from a ratio C _(7.4±0.15)H to a ratio C _(12.4±0.2)H by means of thermal treatment and outgasing of powder. Measurements of atomic excitation spectra of these samples, using a method of inelastic incoherent neutron scattering, indicate that residual hydrogen is chemically bound to carbon, while a removed fraction was composed of adsorbed water. The total cross section of scattering of neutrons with a wavelength of 4.4 ? on residual hydrogen atoms equals 108 ± 2 b; it weakly changes with temperature. Thus preliminary cleaning of powder from hydrogen and its moderate cooling do not improve considerably neutron albedo from powder of nano-diamonds. An alternative approach is isotopic replacement of hydrogen by deuterium.
机译：为了获得增加钻石纳米颗粒粉末中非常冷的中子反照率的可行性，我们研究了氢结合到钻石纳米颗粒表面的氢，氢会引起中子的不必要损失。我们表明，通过热处理和粉末除气，可以将氢原子的比例从C _（7.4±0.15）H降低到C _（12.4±0.2）H。使用非弹性非相干中子散射方法对这些样品的原子激发光谱进行测量，结果表明残留的氢化学键合到碳上，而除去的部分则由吸附的水组成。波长为4.4？的中子散射的总横截面。剩余氢原子等于108±2 b;它随温度变化很小。因此，从氢气中进行粉末的初步清洁及其适度的冷却不会明显改善纳米金刚石粉末中的中子反照率。另一种方法是用氘同位素置换氢。

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