Calculation of double photoionization of helium using the convergent close coupling method

摘要

The convergent close-coupling (CCC) formalism was used to calculate the double to single photoionization cross-sections ratio in helium for photon energies from threshold up to 400 eV. The results for the velocity and acceleration forms of the electromagnetic interaction operator are very close, and lie in between the recent experimental data, with a difference of around 10% to either set. It is concluded that the ratio of double to single photoionization of helium is still unresolved either experimentally or theoretically to a satisfactory accuracy. 19 refs., 1 fig. (Atomindex citation 28:039320)