A master equation approach to double ionization of helium

作者：Selsto Solve^*; Birkeland Tore; Kvaal Simen; Nepstad Raymond; Forre Morten

来源：Journal of Physics B: Atomic, Molecular and Optical Physics , 2011, 44(21): 215003.

DOI：10.1088/0953-4075/44/21/215003

It is demonstrated how a numerical approach based on absorbing boundaries may be used to describe the process of non-sequential two-photon double ionization of helium. Contrary to any method based on solving the Schrodinger equation alone, this numerical scheme is able to reconstruct the remaining particles as one particle is absorbed. This may be used to distinguish between single and double ionization. A model of reduced dimensionality, which describes the process at a qualitative level, has been used. The results have been compared with a more conventional method in which the time-dependent Schrodinger equation is solved and the final wavefunction is analysed in terms of projection onto eigenstates of the uncorrelated Hamiltonian, i.e. with no electron-electron interaction included in the final states. It is found that the two methods indeed produce the same total cross sections for the process.

• 出版日期2011-11-14