Photoabsorption krypton

Fig, 4. Krypton photoabsorption, TDLDA (solid line), RPAE (dashed line), experiment from Ref. 18, (crosses), first I.P, denoted by arrow. 

Krypton and Xenon. Also krypton and xenon autoionizing states were investigated by photoabsorption/electron collisions/ and ion or atom collisions. " Whereas the identification of many singly excited states was possible in these experiments, the assignment of most of the doubly excited states has to be regarded as tentative. The complexity of the spectra is, for example, demonstrated in the electron collision experiments by Baxter... 

Other features of the TDLDA are revealed in the total photoabsorption cross section of krypton just above threshold as illusr-trated in Figure 4, Unlike the RPAE result, the TDLDA cross section is seen to vanish at a threshold energy below the experimental onset. In the LDA, the Coulomb self-interaction of the atomic electrons is not explicitly subtracted away as in the HFA, Hence, all the electrons move in a Z-electron neutral field which decays ex,ponentially... 

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