MULTIELECTRON EXCITATIONS OF NI AND ZN IN X-RAY-ABSORPTION

The x-ray absorption measurements of Ni and Zn are carried out at vari ous temperature in the energy region where multiple transitions are ex pected. XAFS oscillations mask the K+L transition edges of these eleme nts and extend up to over 20 A-1. In the synchrotron radiation facilit y, the sensitivity of about 5x10(-4) in the detection is experimentall y achieved in the energy region of multiexcitations. However, no featu res attributed to multiple photoexcitation are detected in the spectra . The result can be explained by theoretical predictions due to lower shakeup probabilities for K+L transitions in Ni and Zn.