Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 5: Posters Tuesday (Photoionisation, Multi Photon Processes)
A 5.1: Poster
Dienstag, 3. April 2001, 12:30–15:00, AT3
High resolution measurements and multichannel quantum defect analysis of the Kr(nd′ J=2,3) autoionizing resonances — •M.-W. Ruf1, D. Klar1, M. Aslam2, M. A. Baig2, K. Ueda3, and H. Hotop1 — 1Fachbereich Physik, Universität Kaiserslautern, Germany — 2Atomic and Molecular Physics Laboratory, Quaid-i-Azam University, Islamabad, Pakistan — 3Research Institute for Scientific Measurements, Tohoku University, Sendai, Japan
Using resonant two-photon laser excitation of metastable Kr(5s) atoms via selected Kr(5p) levels, we have recorded the low-lying autoionizing resonances Kr(nd′, J = 2, 3) (n = 6, 7) at high resolution in two different experiments (atomic beam spectroscopy and optogalvanic spectroscopy in a discharge). Accurate values for the resonance positions (quantum defects) and the (reduced) widths have been determined and profile indeces are reported. For comparison, multichannel quantum defect theory (MQDT) analyses, using energy dependent MQDT parameters, have been carried out for the odd Kr(J=1,2,3) levels, yielding good agreement in the quantum defects and partial agreement in the predicted reduced widths for the nd′ resonances with the experimental values. Moreover, simplified phase-shifted quantum defect theory analyses of the measured bound odd Kr(J = 2 and 3) Rydberg levels were carried out with the aim to provide improved insight into the dominant decay mechanism of the resonances. This work has been supported by the Deutsche Forschungsgemeinschaft (Forschergruppe Niederenergetische Elektronenstreuprozesse) and through the Graduiertenkolleg Laser- und Teilchenspektroskopie.