Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 5: Posters Tuesday (Photoionisation, Multi Photon Processes)

A 5.18: Poster

Dienstag, 3. April 2001, 12:30–15:00, AT3

On shapes of the single- and double-excitation autoionization resonances in the photoabsorption of outer shells of Kr. — •V.L. Sukhorukov¹, I.D. Petrov¹, B.M. Lagutin¹, Ph.V. Demekhin¹, K.-H. Schartner², H. Liebel³, A. Ehresmann³, and H. Schmoranzer³ — ¹Rostov State University of TC, 344038 Rostov-on-Don, Russia — ²I. Phys. Inst., Justus-Liebig-Universität, D-35392 Giessen, Germany — ³FB Physik, Universität Kaiserslautern, D-67653 Kaiserslautern, Germany

Measurements of the total and partial photoionization cross sections near the 4s-threshold of the Kr atom exhibited a well-pronounced resonance structure connected with the doubly-excited states [1,2]. From the calculations performed in [2] the majority of the observed features were interpreted. However, discrepancies between the computed and measured shapes of the resonances remained in many cases. Thus we applied the K-matrix technique to compute the shapes of the first peaks 4s → 5p observable in the 4p-photoabsorption. This allowed to include the interchannel mixing caused by the spin-orbit interaction of 4p-electrons and the interaction between resonances via continua under consideration. A substantially better agreement of the calculated and measured shapes of the resonances was obtained. A similar technique is planned to be applied for computing the resonances in the 4s- and corresponding satellite states photoionization.

[1] M.G. Flemming et al., Phys. Rev. A 44 (1991) 1733.

[2] H. Schmoranzer et al., J. Phys. B: At. Mol. Opt. Phys. 30 (1997) 4463.