Search for multipleK+Lphotoionization in solid transition elements by x-ray-absorption spectroscopy

Abstract

The x-ray absorption of transition metals from Cr to Zn is examined in the energy region of E+L double photoabsorption. A variational procedure is developed to extract correlated components from pairs of spectra. Applied to absorption spectra taken at different sample temperatures, the procedure is used to suppress the extended x-ray-absorption fine-structure oscillations that pervade the E +L region in this range of elements. A relative sensitivity of 2X10 ' to 3X10 of the absorption coefficient, depending on the sample quality, is achieved. No significant features attributable to multiple photoexcitation are found in the spectra on that level, so that previous reports of E +L edges for Co, Ni, and Zn are not confirmed.

Evolution on Kα in Fe and Lβ satellites in Au in SPring-8

“…However, no significant features attributable to multiple photoexcitation are found in the spectra, so that K +L edges for 3d elements were not confirmed [1,2]. However, no significant features attributable to multiple photoexcitation are found in the spectra, so that K +L edges for 3d elements were not confirmed [1,2].…”

“…The observed intensity of the satellite with excitation energy is shown in Fig. An abrupt intensity jump is predicted for shake-up at threshold while shakeoff should increase smoothly from zero [1,2,12,13]. 2.…”

Double-core ionization and excitation above the sulphur K-edge in , and

“…Double-core electron ionization and excitation in atoms, molecules and solids have been recently investigated in many experimental and theoretical studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Their existence corresponds to a departure from the independent electron model and is, therefore, a direct manifestation of the electronic correlation.…”

“…Such processes give rise in x-ray absorption spectra (XAS) to weak edge-jump and/or narrow structures far above the edge under study and superimposed on the single-electron excitation onset. Several works have questioned their influence on the accuracy of the extended x-ray absorption fine structure analysis [1][2][3], and the tendency is now to take these effects into account routinely [4]. The present limits of experiment and theory describing multi-core electron processes in atoms are best illustrated in the case of krypton [5] and argon [6,7].…”