Some spectroscopic data for calibration purposes

Energies and natural level widths for resonance excitation Doubly-excited states in He  

4d - np excitations in xenon (photoabsorption data from [EMa75] see also electron impact data [KTR77] for more recent data see [AOM95, MSY95])  

Ne (for K-L2 3L2 3 transitions optical data [Moo70] and Is ionization energy [PNS82] for other transitions relative values from [ATW90] adapted to K-L2 3L2 3 D2 see also [KMe66, KCM71])  

Xe (optical data from [HP382] and 4d ionization energies from [KTR77] these values correct the ones given by [WBS72], see also [ONS76])  

Angular distribution parameters ft of photoelectrons Is photoionization in helium / = 2.0 (in dipole approximation) 

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