Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 5: Posters Tuesday (Photoionisation, Multi Photon Processes)
A 5.12: Poster
Dienstag, 3. April 2001, 12:30–15:00, AT3
Line shapes in photo-excitation of triply excited hollow states — •Lars Bojer Madsen1 and Peter Lambropoulos2 — 1Institute of Physics and Astronomy,University of Aarhus, DK-8000 Aarhus C, Denmark — 2Foundation for Research and Technology Hellas, Institute of Electronic Structure and laser, P.O. Box 1527, Heraklion 71110 Crete, and Department of Physics, University of Crete, Greece
Taking as point of departure a frequently used experimental detection scheme, we present a derivation of the analytical expressions of the line shapes in partial decay channels pertaining to photo-excitation of triply excited hollow states in atomic lithium with subsequent autoionization into a specific doubly excited state in the singly charged ion. The line shapes represent useful generalizations of the Fano parameterization of the profile of an autoionizing resonance. The line shapes give the positions and widths of the triply excited autoionizing resonances, and carry information about specific partial autoionization widths, and partial asymmetry parameters. It is also shown, that introducing a laser-induced transition from the triply excited state to another lower lying one, provides a knob that can be used to gain direct information about partial widths. The schemes are readily implemented experimentally, and would allow for the first measurements of such quantities.