| Issue |
Europhys. Lett.
Volume 40, Number 4, November II 1997
|
|
|---|---|---|
| Page(s) | 363 - 368 | |
| Section | General | |
| DOI | https://doi.org/10.1209/epl/i1997-00472-2 | |
| Published online | 01 September 2002 | |
Photo-ionization of the helium atom close to the double-ionization threshold: Towards the Ericson regime
Laboratoire Kastler-Brossel, Université Pierre et Marie Curie,
4 Place Jussieu, 75005 Paris, France
Received:
21
July
1997
Accepted:
1
October
1997
We calculate the photo-ionization cross-section from the
ground state of the helium atom, using the complex rotation
method and diagonalization of sparse matrices.
This produces directly the positions and widths of the
doubly excited 
resonances together
with the photo-ionization cross-section.
Our calculations up to the N=9 threshold
are in perfect agreement with recent experimental
data and show the transition from a regular structure at low energy
to a chaotic one at high energy, where various resonances strongly
overlap.
PACS: 05.45.+b – Theory and models of chaotic systems / 31.15.Ar – Ab initio calculations / 32.80.Fb – Photoionization of atoms and ions
© EDP Sciences, 1997
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