Curtin University, Australia

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Curtin University
I. Bray
Convergent Close Coupling. Two independent implementations. NR version is more stable. First is applicable to electron, positron and photon collisions with quasi-one and two electron atoms and ions. Provides cross sections for excitation and ionization.

Recent applications of the CCC method[1]

There has been considerable progress in the development of the Convergent Close-Coupling (CCC) theory. The major extension has been to institute a new parallelism paradigm. This utilizes a hybrid OPENMP/MPI combination with the main V-matrix being calculated across several nodes. Within each node the original OPENMP parallelism is used. Then, using MPI, the matrix is distributed in a block cyclic form across all the available cores suitable for solving the linear equations via the ScaLAPACK suite of routines.

Consequently the CCC code is now able to be run across many nodes of memory sharing multiple cores. Both the original non-relativistic CCC and the recently developed relativistic RCCC codes have been parallelized this way. Additionally, the RCCC code has been extended to quasi two-electron targets, and highly charged ions, including Breit or Møller corrections.

Recent applications of the CCC method include electron impact ionization of helium and electron-impact excitation of mercury and highly charge uranium ions. Currently the CCC method is being used to calculate electron-impact excitation and ionization of the He-like Li ion.


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