dorsal/arxiv
View SchemaDynamics of multiply charged ions in intense laser fields
| Authors | S. X. Hu, C. H. Keitel |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0005053 |
| URL | https://arxiv.org/abs/quant-ph/0005053 |
| DOI | 10.1103/PhysRevA.63.053402 |
Abstract
We numerically investigate the dynamics of multiply charged hydrogenic ions in near-optical linearly polarized laser fields with intensities of order 10^16 to 10^17 W/cm^2. Depending on the charge state Z of the ion the relation of strength between laser field and ionic core changes. We find around Z=12 typical multiphoton dynamics and for Z=3 tunneling behaviour, however with clear relativistic signatures. In first order in v/c the magnetic field component of the laser field induces a Z-dependent drift in the laser propagation direction and a substantial Z-dependent angular momentum with repect to the ionic core. While spin oscillations occur already in first order in v/c as described by the Pauli equation, spin induced forces via spin orbit coupling only appear in the parameter regime where (v/c)^2 corrections are significant. In this regime for Z=12 ions we show strong splittings of resonant spectral lines due to spin-orbit coupling and substantial corrections to the conventional Stark shift due to the relativistic mass shift while those to the Darwin term are shown to be small. For smaller charges or higher laser intensities, parts of the electronic wavepacket may tunnel through the potential barrier of the ionic core, and when recombining are shown to give rise to keV harmonics in the radiation spectrum. Some parts of the wavepacket do not recombine after ionisation and we find very energetic electrons in the weakly relativistic regime of above threshold ionization.
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"abstract": "We numerically investigate the dynamics of multiply charged hydrogenic ions\nin near-optical linearly polarized laser fields with intensities of order 10^16\nto 10^17 W/cm^2. Depending on the charge state Z of the ion the relation of\nstrength between laser field and ionic core changes. We find around Z=12\ntypical multiphoton dynamics and for Z=3 tunneling behaviour, however with\nclear relativistic signatures. In first order in v/c the magnetic field\ncomponent of the laser field induces a Z-dependent drift in the laser\npropagation direction and a substantial Z-dependent angular momentum with\nrepect to the ionic core. While spin oscillations occur already in first order\nin v/c as described by the Pauli equation, spin induced forces via spin orbit\ncoupling only appear in the parameter regime where (v/c)^2 corrections are\nsignificant. In this regime for Z=12 ions we show strong splittings of resonant\nspectral lines due to spin-orbit coupling and substantial corrections to the\nconventional Stark shift due to the relativistic mass shift while those to the\nDarwin term are shown to be small. For smaller charges or higher laser\nintensities, parts of the electronic wavepacket may tunnel through the\npotential barrier of the ionic core, and when recombining are shown to give\nrise to keV harmonics in the radiation spectrum. Some parts of the wavepacket\ndo not recombine after ionisation and we find very energetic electrons in the\nweakly relativistic regime of above threshold ionization.",
"arxiv_id": "quant-ph/0005053",
"authors": [
"S. X. Hu",
"C. H. Keitel"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.63.053402",
"title": "Dynamics of multiply charged ions in intense laser fields",
"url": "https://arxiv.org/abs/quant-ph/0005053"
},
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