Physics – Atomic Physics
Scientific paper
2007-01-08
Phys Rev Lett 98, 113001 (2007)
Physics
Atomic Physics
4 pages, 1 figure
Scientific paper
10.1103/PhysRevLett.98.113001
The cross sections for single-electron photo-ionisation in two-electron atoms show fluctuations which decrease in amplitude when approaching the double-ionisation threshold. Based on semiclassical closed orbit theory, we show that the algebraic decay of the fluctuations can be characterised in terms of a threshold law $\sigma \propto |E|^{\mu}$ as $E \to 0_-$ with exponent $\mu$ obtained as a combination of stability exponents of the triple-collision singularity. It differs from Wannier's exponent dominating double ionisation processes. The details of the fluctuations are linked to a set of infinitely unstable classical orbits starting and ending in the non-regularisable triple collision. The findings are compared with quantum calculations for a model system, namely collinear helium.
Byun Chang Woo
Choi Nark Nyul
Lee Min-Ho
Tanner Gregor
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