Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 13: Photoionisation I (joint session A and MO)

A 13.9: Vortrag

Donnerstag, 5. April 2001, 17:45–18:00, H1012

l-dependent alignment transfer in the autoionization of doubly excited Ne 2p⁴ (³P) 3p ²P_3/2,1/2 nl-states — •Bernd Zimmermann¹, Sven Kammer¹, Sascha Mickat¹, Karl-Heinz Schartner¹, Holger Liebel², Arno Ehresmann², Hans Schmoranzer², and Viktor Sukhorukov³ — ¹JLU Giessen, 1. Phys. Institut, Heinrich-Buff-Ring 16, 35392 Giessen — ²Uni Kaiserslautern, 67653 Kaiserslautern — ³Rostov State University of Transport and Communications, 344038 Rostov-on-Don, Russia

The photon induced Ne⁺ 2p⁴ (³P) 3p ⁴P_3/2–satellite is populated only through autoionization, because it is forbidden in LS-coupling. These autoionization resonances are well known and can be assigned easiliy. Using linear polarized light from BESSY II, high resolution studies applying photon induced fluorescence spectroscopy (PIFS) resolve the finestructure splitting of the Ne 2p⁴ (³P) 3p ²P_3/2,1/2 ns,nd Rydberg series, which decay into the Ne⁺ 2p⁴ (³P) 3p ⁴P_3/2–satellite. Measuring the alignment parameter A₂₀ of the Ne⁺ 2p⁴ (³P) 3p ⁴P_3/2–state, the ns– and nd–series show different values. The experimental results allow to conclude that the autoionization of the ns–electron occurs predominantly through the emission of the s_1/2–partial wave, while for nd–electrons the d_5/2–partial wave dominates.