dorsal/arxiv
View SchemaTheory of x-ray absorption by laser-dressed atoms
| Authors | Christian Buth, Robin Santra |
|---|---|
| Categories | |
| ArXiv ID | physics/0611122 |
| URL | https://arxiv.org/abs/physics/0611122 |
| DOI | 10.1103/PhysRevA.75.033412 |
| Journal | Phys. Rev. A 75, 033412 (2007) (12 pages), republication in Virtual Journal of Ultrafast Science 6, issue 4 (2007) |
Abstract
An ab initio theory is devised for the x-ray photoabsorption cross section of atoms in the field of a moderately intense optical laser (800nm, 10^13 W/cm^2). The laser dresses the core-excited atomic states, which introduces a dependence of the cross section on the angle between the polarization vectors of the two linearly polarized radiation sources. We use the Hartree-Fock-Slater approximation to describe the atomic many-particle problem in conjunction with a nonrelativistic quantum-electrodynamic approach to treat the photon-electron interaction. The continuum wave functions of ejected electrons are treated with a complex absorbing potential that is derived from smooth exterior complex scaling. The solution to the two-color (x-ray plus laser) problem is discussed in terms of a direct diagonalization of the complex symmetric matrix representation of the Hamiltonian. Alternative treatments with time-independent and time-dependent non-Hermitian perturbation theories are presented that exploit the weak interaction strength between x rays and atoms. We apply the theory to study the photoabsorption cross section of krypton atoms near the K edge. A pronounced modification of the cross section is found in the presence of the optical laser.
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"abstract": "An ab initio theory is devised for the x-ray photoabsorption cross section of\natoms in the field of a moderately intense optical laser (800nm, 10^13 W/cm^2).\nThe laser dresses the core-excited atomic states, which introduces a dependence\nof the cross section on the angle between the polarization vectors of the two\nlinearly polarized radiation sources. We use the Hartree-Fock-Slater\napproximation to describe the atomic many-particle problem in conjunction with\na nonrelativistic quantum-electrodynamic approach to treat the photon-electron\ninteraction. The continuum wave functions of ejected electrons are treated with\na complex absorbing potential that is derived from smooth exterior complex\nscaling. The solution to the two-color (x-ray plus laser) problem is discussed\nin terms of a direct diagonalization of the complex symmetric matrix\nrepresentation of the Hamiltonian. Alternative treatments with time-independent\nand time-dependent non-Hermitian perturbation theories are presented that\nexploit the weak interaction strength between x rays and atoms. We apply the\ntheory to study the photoabsorption cross section of krypton atoms near the K\nedge. A pronounced modification of the cross section is found in the presence\nof the optical laser.",
"arxiv_id": "physics/0611122",
"authors": [
"Christian Buth",
"Robin Santra"
],
"categories": [
"physics.atom-ph",
"physics.optics"
],
"doi": "10.1103/PhysRevA.75.033412",
"journal_ref": "Phys. Rev. A 75, 033412 (2007) (12 pages), republication in\n Virtual Journal of Ultrafast Science 6, issue 4 (2007)",
"title": "Theory of x-ray absorption by laser-dressed atoms",
"url": "https://arxiv.org/abs/physics/0611122"
},
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