Various correlated photoionization processes in helium are calculated by direct solution of the time-dependent Schr\"odinger equation. An inhomogeneous set of time-dependent close-coupled partial differential equations are partitioned on a numerical lattice for easy implementation on massively parallel computers. Projection of the time evolved wave function onto lattice eigenstates for He⁺ yields cross sections for photoionization with excitation and double photoionization. The computational results are compared with recent experimental measurements.
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Pindzola et al. (1998) studied this question.
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