Abstract
A unified R-matrix-Floquet theory, which previously enabled the interaction of intense laser fields with complex atoms and atomic ions to be calculated in a fully nonperturbative manner, has been extended to enable the interaction of intense laser fields with complex diatomic molecules to be treated. The theory takes advantage of the R-matrix division of configuration space into internal and external regions and treats the interaction between the laser field and the target molecule in each region using the most appropriate form of the interaction Hamiltonian. This enables standard multi-centre electron molecule scattering programs to be modified in a straightforward way to solve the problem in the internal region and single-centre atomic multiphoton propagator methods to be extended to solve the problem in the external region. In this paper, these new theoretical and computational developments are summarised and the first multiphoton ionisation calculations for H 2 are presented.
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