An assessment of the effective Gaunt factor approximation |
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Authors: | SM Younger WL Wiese |
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Institution: | National Bureau of Standards, National Measurement Laboratory, Washington, DC 20234, U.S.A. |
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Abstract: | Based on comparisons with recent theoretical data, it is shown that the effective Gaunt factor for Δn = 0 transitions in alkali-like ions is within 25% of unity in most cases and is a slowly varying function of energy. A more complex energy dependence is noted for some non-alkali-like spectra, and especially for Δn ≠ 0 excitations. A method for the approximation of important correlation effects in the target is discussed for transitions of the type ns21S-nsnp1P0. |
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