dorsal/arxiv
View SchemaNonsequential double ionization: a comparison of classical simulations and $S$-matrix results
| Authors | Phay J. Ho, X. Liu, W. Becker |
|---|---|
| Categories | |
| ArXiv ID | physics/0703219 |
| URL | https://arxiv.org/abs/physics/0703219 |
Abstract
In a fully classical simulation, we investigate the recollision mechanism of non-sequential double ionization (NSDI) and its manifestation in the end-of-pulse electron momentum distributions. We compare two different electron-electron potentials: a soft-core Coulombic potential and a Yukawa potential. We also implement the strong-field approximation (SFA), which is commonly made in quantum-mechanical $S$-matrix calculations, in our classical simulations and study its consequences. We find that, regardless of the form of the e-e potential, the SFA modifies the momentum distributions and recollision dynamics significantly, but more so for the long-range than for the short-range e-e interaction. Surprisingly, our classical results, especially those obtained with the Yukawa potential under the SFA, agree well with the results from the $S$-matrix calculations with a contact e-e interaction. This implies that the recollision dynamics initiated by a quantum tunneling process and a purely classical process do not deviate much from each other. Furthermore, our classical predictions of travel times are consistent with the results from the simple-man model, and the most probable thermalization time is found to be within 0.15 and 0.25 laser periods.
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"abstract": "In a fully classical simulation, we investigate the recollision mechanism of\nnon-sequential double ionization (NSDI) and its manifestation in the\nend-of-pulse electron momentum distributions. We compare two different\nelectron-electron potentials: a soft-core Coulombic potential and a Yukawa\npotential. We also implement the strong-field approximation (SFA), which is\ncommonly made in quantum-mechanical $S$-matrix calculations, in our classical\nsimulations and study its consequences. We find that, regardless of the form of\nthe e-e potential, the SFA modifies the momentum distributions and recollision\ndynamics significantly, but more so for the long-range than for the short-range\ne-e interaction. Surprisingly, our classical results, especially those obtained\nwith the Yukawa potential under the SFA, agree well with the results from the\n$S$-matrix calculations with a contact e-e interaction. This implies that the\nrecollision dynamics initiated by a quantum tunneling process and a purely\nclassical process do not deviate much from each other. Furthermore, our\nclassical predictions of travel times are consistent with the results from the\nsimple-man model, and the most probable thermalization time is found to be\nwithin 0.15 and 0.25 laser periods.",
"arxiv_id": "physics/0703219",
"authors": [
"Phay J. Ho",
"X. Liu",
"W. Becker"
],
"categories": [
"physics.atom-ph"
],
"title": "Nonsequential double ionization: a comparison of classical simulations and $S$-matrix results",
"url": "https://arxiv.org/abs/physics/0703219"
},
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