The electric field strength in the near-wall layers of thermonuclear facilities can be sufficient for the emission of negative ions from the surface of plasma facing materials. The mass spectra of negative ions from MPG-8 porous graphite at electric field strengths up to 4 × 10 ~6 V/m and the surface composition of the target have been studied by ion scattering spectroscopy. The dependence of the mass composition of negative ion emission and residual gas on the sample's temperature has been measured and a correlation between the intensity of negative hydrogen-ion emission and the desorption of water has been established. The temperature dependence of the emission of negative ions and clusters of carbon and hydrocarbon is in qualitative agreement with the chemical erosion of graphite.
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机译：热核设施的近壁层中的电场强度可能足以从面对等离子的材料表面发射负离子。通过离子散射光谱研究了MPG-8多孔石墨在电场强度高达4×10〜6 V / m时的负离子质谱图和靶的表面组成。测量了负离子发射和残留气体的质量组成与样品温度的相关性，并确定了负氢离子发射强度与水解吸之间的相关性。负离子以及碳和烃簇的发射与温度的关系与石墨的化学侵蚀在质量上是一致的。
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