Near threshold 4d photoexcitation and photoionization of Xe

The angular distribution parameters beta of the N 5 -0 2,3 O 2,3 Auger lines has been measured between the 4d 5/2 and the 4d 3/2 thresholds of Xe using the CIS technique. The radiationless decay parameter alpha 2 for each of the N 5 -O 2 , 3 O 2.3 Auger lines and the alignment parameter A 20 for the intermediate ion were also determined. Comparisons with previous values of beta and alpha 2 for the N 5 -O 2.3 O 2.3 Auger lines have been made. In addition, shakeoff to the various states of the Xe 2+ 5p 4 ion has been measured following 4d photoexcitation and found to be small. These results support the contention that near-zero kinetic energy electrons observed following similar photoexcitation in the rare gases result primarily from a two-step process rather than the direct process of shakeoff.