Photoabsorption xenon

Zangwill and Soven [10] have calculated the photoabsorption spectrum of rare-gas atoms from the frequency-dependent KS equations (156)-(157) within the ALDA. As an example for the quality of the results we show, in Fig. 3, the photoabsorption cross section of Xenon just above the 4d threshold. The agreement with experiment is remarkably good. Results of similar quality have been achieved for the photoresponse of small molecules [156, 157]. 

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... 

Figure 2 Photoionization mass spectrum of xenon between the 2P3/2 (ground) and (excited) ionic states, displaying sharp s like and broad d -like resonances. Reproduced with permission of Academic Press from Berkowitz J (1979) Photoabsorption, Photoionization, and Photoeiectron Spectroscopy, Chapter VI.

In Figure 1 the photoabsorption cross section of xenon near the 4d threshold is shown in the LDA, HF and experiment. Unlike HF, the length and velocity forms of the matrix elements are identical in the LDA because V (x) is completely local. This figure illustrates that neither the LDA nor the simplest HFA is sufficient to describe... 

Fig. 1. Xenon 4d total photoabsorption, LDA (solid line), HFA (dashed line), experiment from Ref. 9 (dotted line).

Fig. 2, Xenon 4d tot l photoabsorption. RPAE (dashed line) TDLDA (solid line), experiment (dotted line) and TDLDA without induced XC (dashedrdot line).

Figure 15 (a) Second derivatives of the real and the imaginary parts of the dielectric function of P-rhombohedral boron in the spectral range of fundamental absorption (104). (b) Photoconductivity of P-rhombohedral boron in the low-energy tail of the fundamental absorption. Conditions of measurement 155 K, sample annealed at 450 K, cooled down to 155 K, 1-h excitation by a xenon arc lamp, quickly cooled down to 90 K, then measured 320 K, sample annealed at 450 K, cooled down to 320 K, then measured without (unexcited) or after 1-h excitation with a xenon arc lamp. The ionization energies of the electron traps known from absorption and photoabsorption measurements are indicated (105). 

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