Formulas have been derived for the averages and widths of the distributions of energy levels and line wave numbers in atomic spectra. For some types of transitions, the mean wave number is not equal to the difference of the energy averages of the configurations. Allowance for this effect improves the interpretation of highly ionized Mo spectra.
© 1978 Optical Society of America
C. Bauche-Arnoult, J. Bauche, and M. Klapisch, "Mean wavelength and spectral width of transition arrays in x-uv atomic spectra," J. Opt. Soc. Am. 68, 1136-1139 (1978)