R-Matrix Techniques for Intermediate Energy Scattering and Photoionization
One of the most interesting challenges facing theories of electron-molecule collisions is to provide accurate descriptions of collisions at intermediate energies where large numbers of electronic states of the target are strongly coupled and where there are significant resonant processes. In this region there are an infinite number of open channels including ionizing channels. In order to obtain accurate representations of the target wavefunctions it may be necessary to use large configuration interaction (CI) expansions. In view of these difficulties it is perhaps not surprising that so far there have been few investigations of the topic. In this chapter the progress which has been made to apply R-matrix theory to intermediate energy scattering will be reviewed. Some ideas concerning possible future work are also mentioned.
KeywordsExternal Region Complex Energy Hamiltonian Matrix Continuum Orbital Hamiltonian Matrix Element
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