dorsal/arxiv
View SchemaClassical and quantum-mechanical treatments of nonsequential double ionization with few-cycle laser pulses
| Authors | C. Figueira de Morisson Faria, X. Liu, A. Sanpera, M. Lewenstein |
|---|---|
| Categories | |
| ArXiv ID | physics/0405093 |
| URL | https://arxiv.org/abs/physics/0405093 |
| DOI | 10.1103/PhysRevA.70.043406 |
| Journal | Phys. Rev. A 70, 043406 (2004) |
Abstract
We address nonsequential double ionization induced by strong, linearly polarized laser fields of only a few cycles, considering a physical mechanism in which the second electron is dislodged by the inelastic collision of the first electron with its parent ion. The problem is treated classically, using an ensemble model, and quantum-mechanically, within the strong-field and uniform saddle-point approximations. In the latter case, the results are interpreted in terms of "quantum orbits", which can be related to the trajectories of a classical electron in an electric field. We obtain highly asymmetric electron momentum distributions, which strongly depend on the absolute phase, i.e., on the phase difference between the pulse envelope and its carrier frequency. Around a particular value of this parameter, the distributions shift from the region of positive to that of negative momenta, or vice-versa, in a radical fashion. This behavior is investigated in detail for several driving-field parameters, and provides a very efficient method for measuring the absolute phase. Both models yield very similar distributions, which share the same physical explanation. There exist, however, minor discrepancies due to the fact that, beyond the region for which electron-impact ionization is classically allowed, the yields from the quantum mechanical computation decay exponentially, whereas their classical counterparts vanish.
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"abstract": "We address nonsequential double ionization induced by strong, linearly\npolarized laser fields of only a few cycles, considering a physical mechanism\nin which the second electron is dislodged by the inelastic collision of the\nfirst electron with its parent ion. The problem is treated classically, using\nan ensemble model, and quantum-mechanically, within the strong-field and\nuniform saddle-point approximations. In the latter case, the results are\ninterpreted in terms of \"quantum orbits\", which can be related to the\ntrajectories of a classical electron in an electric field. We obtain highly\nasymmetric electron momentum distributions, which strongly depend on the\nabsolute phase, i.e., on the phase difference between the pulse envelope and\nits carrier frequency. Around a particular value of this parameter, the\ndistributions shift from the region of positive to that of negative momenta, or\nvice-versa, in a radical fashion. This behavior is investigated in detail for\nseveral driving-field parameters, and provides a very efficient method for\nmeasuring the absolute phase. Both models yield very similar distributions,\nwhich share the same physical explanation. There exist, however, minor\ndiscrepancies due to the fact that, beyond the region for which electron-impact\nionization is classically allowed, the yields from the quantum mechanical\ncomputation decay exponentially, whereas their classical counterparts vanish.",
"arxiv_id": "physics/0405093",
"authors": [
"C. Figueira de Morisson Faria",
"X. Liu",
"A. Sanpera",
"M. Lewenstein"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.70.043406",
"journal_ref": "Phys. Rev. A 70, 043406 (2004)",
"title": "Classical and quantum-mechanical treatments of nonsequential double ionization with few-cycle laser pulses",
"url": "https://arxiv.org/abs/physics/0405093"
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