Photo-ionization cross-sections are presented for C iii, C iv, C v, N iii, N iv, N v, 0 iii, 0 iv, 0 v, Ne ii, Ne In, Ne iv, and Ne v, as calculated by the screening theory, the quantum-defect method (where possible), and the hydrogenic approximation. These ions contribute to the opacity in the atmospheres of the central stars of planetary nebulae
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M B Hidalgo (1968) studied this question.
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