Advances in X-ray Spectroscopy. Contributions in Honour of by C. Bonnelle and C. Mandé (Eds.)

By C. Bonnelle and C. Mandé (Eds.)

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After Ref. 7). 8) and there are even signs of continuous absorption, though this last point must be treated with caution since the experiments to date are based on photographic records. Crossings in the 3d, 4d and 5d inner-shell excitation sequences have been invest­ igated in this way, using synchrotron radiation, and the results suggest that photoelectron spectroscopy could be applied with advantage to probe satellite structure in the corresponding core-hole spectra. It will be noticed that there is a strong similarity between the breakdown of the independent particle model, which occurs when the lowest double ionisation threshold coincides in energy with an inner-shell excitation spectrum, and the situation described by Wendin and Ohno 18 .

Data Tables, J^4 (1974) 605. 3. W. G. Wills, Phys. , J£5 (1969) 1429. 4. C. Barrett, Phys. Lett. , 3^ (1970) 388. 5. R. , At. Data Nucl. Data Tables, U 6. B. Chesler and F. Boehm, Phys. , 166 (1968) 1202. 7. Y. R. Acad. , 195 (1932) 1429; (1974) 509. , Am. , 1 (1934) 215. Nuclear Finite Size Effects 89 8. H. Johann, Z. M. A. Kirkpatrick, Rev. Sei. , 1 (1930) 88. 9. 1. F. l. V. S. Rylnikov, Zh. Eksp. Teor. , 5IJ (1966) 861. CSov. Phys. JETP, 23 (1966) 572]. 10. 1. V. S. S. I. Grushko, Yad. , £ (1967) 544.

17). 4. The reason for the T 220 1 210 1 1 200 1 1 1 190 1 180 1 i 170 1 1 160 1 r 150 140 Binding energy - £ / e V Fig. 4 The photo-electron spectrum of atomic Xe in the 4s-4p region : experiment (Gelius 2 1 ); : theory (Wendin and O h n o 1 8 ) . anomaly can be traced back to the near-energy degeneracy of the 4p 1Vl ,2 threshold with the 4d8-thresholds. Both Xe and Ba are close to the beginning of the 4ftransition sequence and, for reasons which are well understood (cf. Connerade ) possess large 4d-photo-ionisation cross-sections which are strongly collective in character 23 .

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