Hamburg 2009 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 33: Interaction with VUV and X-Ray Light II
A 33.4: Vortrag
Donnerstag, 5. März 2009, 18:00–18:15, VMP 8 R208
Threshold behavior of quantum oscillations in spatially integrated and directionally fixed in space systems — •Sanja Korica1, Axel Reinköster1, Markus Braune1, Daniel Rolles2, Burkhard Langer3, and Uwe Becker1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft Berlin — 2CFEL Hamburg — 3Frei Universität Berlin
Oscillatory behavior of particle breakup processes is the result of quantum interference between different emission pathways. Prominent examples are the partial cross section oscillations in the ionization of fullerenes and homonuclear diatomic molecules. This behavior may be described in the simplest way by a ’ripple tank’ simulation. Such a simulation predicts a cosine-like threshold behavior of these oscillations. New near threshold measurements of the photoionization of C60 and N2 corroborate these predictions. They are, however, in contrast to corresponding measurements and theoretical calculations of the photoinization probability for fixed in space N2 molecules along the molecular axis [1]. The threshold behavior of the quantum oscillations of this system points more to a sine-like function. The ’ripple tank’ simulation exhibits also a difference between the two kinds of measurements, however much less pronounced. This may be due to the different periodical functions employed in this simulation compared to the real photoionization process.
[1] Zimmermann et al. Nature Physics, Vol.4, 649, 2008.