Close coupling

In atomic physics, close coupling is a quantum mechanics method to calculate the multi-electronic atomic and molecular structure from fine structure to hyperfine structure levels and dynamic processes including photoionization,[1][2] collisional excitation and ionization as well as autoionization and their inverse processes. In this method, the multi-electron systems are treated as a loosely interacting electron with a target ionic or neutral atomic as well as molecular, in which the electrons are strongly interactive with each other. The interactive atomic or molecular complex system is reduced into a so-called (N+1) problem. Based on this scheme, the inter-channel interaction, that is, configuration interactions (CI) are involved.

Integrated with other techniques, especially the matrix techniques and multi-channel quantum defect theory, close-coupling method could provide precise structural and dynamical studies of atomic and molecular systems.

References

  1. ^ Lu, K. T. (1971-08-01). "Spectroscopy and Collision Theory. The Xe Absorption Spectrum". Physical Review A. 4 (2): 579–596. Bibcode:1971PhRvA...4..579L. doi:10.1103/physreva.4.579. ISSN 0556-2791.
  2. ^ Seaton, M J (1983-02-01). "Quantum defect theory". Reports on Progress in Physics. 46 (2): 167–257. doi:10.1088/0034-4885/46/2/002. ISSN 0034-4885. S2CID 250797547.


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