|Author||Foerre, Morten ♦ Nepstad, Raymond ♦ Selstoe, Soelve|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||ATOMIC AND MOLECULAR PHYSICS ♦ APPROXIMATIONS ♦ ATOMS ♦ COMPARATIVE EVALUATIONS ♦ DIFFERENTIAL CROSS SECTIONS ♦ EV RANGE ♦ HELIUM ♦ IONIZATION ♦ NEON ♦ PHOTON-ATOM COLLISIONS ♦ PHOTONS ♦ TOTAL CROSS SECTIONS ♦ ATOM COLLISIONS ♦ BOSONS ♦ CALCULATION METHODS ♦ COLLISIONS ♦ CROSS SECTIONS ♦ ELEMENTARY PARTICLES ♦ ELEMENTS ♦ ENERGY RANGE ♦ EVALUATION ♦ FLUIDS ♦ GASES ♦ MASSLESS PARTICLES ♦ NONMETALS ♦ PHOTON COLLISIONS ♦ RARE GASES|
|Abstract||We develop an approximate model for the process of direct (nonsequential) two-photon double ionization of atoms. Employing the model, we calculate (generalized) total cross sections as well as energy-resolved differential cross sections of helium for photon energies ranging from 39 to 54 eV. A comparison with results of ab initio calculations reveals that the agreement is at a quantitative level. We thus demonstrate that this complex ionization process can be described by the simple model, providing insight into the underlying physical mechanism. Finally, we use the model to calculate generalized cross sections for the two-photon double ionization of neon in the nonsequential regime.|
|Learning Resource Type||Article|
|Publisher Place||United States|
|Journal||Physical Review Letters|
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