Abstract
A generalization of the standard effective Hamiltonian theory is presented, based on the breaking of the one-to-one correspondence between the model and the target spaces. In this way the target space can be smaller than the model space, and problems connected to the presence of intruder states can be solved. An application to the dimer of lithium is given. Moreover, it is shown how the formalism can be translated into an iterative approach, and test computations are presented.
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