dorsal/arxiv
View SchemaWannier threshold law for two electron escape in the presence of an external electric field
| Authors | Bruno Eckhardt, Krzysztof Sacha |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0109143 |
| URL | https://arxiv.org/abs/quant-ph/0109143 |
| DOI | 10.1209/epl/i2001-00570-7 |
| Journal | Europhysics Letters 56, 651 (2001). |
Abstract
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 sigma=E^alpha, where the exponent alpha 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.
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"abstract": "We consider double ionization of atoms or ions by electron impact in the\npresence of a static electric field. As in Wanniers analysis of the analogous\nsituation without external field the dynamics near threshold is dominated by a\nsaddle. With a field the saddle lies in a subspace of symmetrically escaping\nelectrons. Near threshold the classical cross section scales with excess energy\nE like sigma=E^alpha, where the exponent alpha can be determined from the\nstability of the saddle and does not depend on the field strength. For example,\nif the remaining ion has charge Z=2, the exponent is 1.292, significantly\ndifferent from the 1.056 without the field.",
"arxiv_id": "quant-ph/0109143",
"authors": [
"Bruno Eckhardt",
"Krzysztof Sacha"
],
"categories": [
"quant-ph",
"nlin.CD",
"physics.atom-ph"
],
"doi": "10.1209/epl/i2001-00570-7",
"journal_ref": "Europhysics Letters 56, 651 (2001).",
"title": "Wannier threshold law for two electron escape in the presence of an external electric field",
"url": "https://arxiv.org/abs/quant-ph/0109143"
},
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