München 2004 – wissenschaftliches Programm

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A: Atomphysik

A 9: Poster 1

A 9.26: Poster

Dienstag, 23. März 2004, 14:00–16:00, Schellingstr. 3

Charge state distributions after K-shell photoionization of K and Ar atoms — •Ralf Schriel^1,2, K. Cole^1,2, M. Hertlein¹, A. Belkacem¹, B. Feinberg¹, J. Maddi¹, M. Prior¹, and R. Dörner² — ¹Lawrence Berekeley Labratory, Berkeley, CA 94720 USA — ²Institut für Kernphysik der Johann Wolfgang Goethe-Universtät, Frankfurt am Main

We have investigated K-shell photoionization of Ar and K at the Advanced Light Source to unravel the effect of the 4s electron of K on the relaxation of the K-shell hole. We measured the charge state distribution as a function of photon energy as it is varied across the respective K-edges of both atoms. Both Ar and K exhibit a very similar mean charge state after the interaction with the photons, with 4+ being the most probable charge state. However our first analysis shows a markedly different envelope of the charge state distribution. We will present the ratio of probabilities Ar^q+/K^q+ for each charge state q as a function of the x-ray energy normalized to the K-edge energy of each atom.