Formation processes and secondary emission coefficients for H/sup -/ production on alkali-coated surfaces (open access)

Formation processes and secondary emission coefficients for H/sup -/ production on alkali-coated surfaces

The formation of negative ions by hydrogen collisions on cesium-coated surfaces is discussed in the limiting cases where the resident cesium is either in the purely ionic state or in the purely atomic state. The survival fraction for negative ions moving away from a metal surface is calculated using a method employing complex eigenvalues. The fraction of surviving ions is found to be larger than calculated by previous workers. The secondary emission coefficient for negative ion production by incident atoms with energies of ten to one hundred electron volts is estimated to be in the range thirty to fifty percent. The secondary emission coefficient is found to be a sensitive function of the thickness of the alkali adsorbate coating for ion energies in the range below a few hundred electron volts.
Date: September 20, 1977
Creator: Hiskes, J.R. & Karo, A.
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San Antonio Register (San Antonio, Tex.), Vol. 46, No. 6, Ed. 1 Friday, May 20, 1977 (open access)

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