| Issue |
Europhys. Lett.
Volume 56, Number 5, December 2001
|
|
|---|---|---|
| Page(s) | 651 - 657 | |
| Section | Atomic and molecular physics | |
| DOI | https://doi.org/10.1209/epl/i2001-00570-7 | |
| Published online | 01 December 2003 | |
Wannier threshold law for two-electron escape in the presence of an external electric field
1
Fachbereich Physik, Philipps-Universität Marburg -
D-35032 Marburg, Germany
2
Instytut Fizyki im. Mariana Smoluchowskiego,
Uniwersytet Jagielloński
ul. Reymonta 4,
PL-30-059 Kraków, Poland
Received:
17
April
2001
Accepted:
20
September
2001
We consider double ionization of atoms or ions by electron impact
in the presence of a static electric field. As in Wanniers analysis
of the analogous situation without external field the dynamics
near threshold is dominated by a saddle. With a field the
saddle lies in a subspace of symmetrically escaping electrons.
Near threshold the classical cross-section scales with excess energy E like
, where the exponent α can be determined
from the stability of the saddle and does not depend on the field
strength. For example, if the remaining ion has charge Z=2, the
exponent is 1.292, significantly different from the 1.056 without the field.
PACS: 34.80.Dp – Atomic excitation and ionization by electron impact / 32.60.+i – Zeeman and Stark effects / 31.25.Jf – Electron correlation calculations for atoms and ions: excited states
© EDP Sciences, 2001
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