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An R-matrix variational principle is presented in which the value of the function on the boundary surface is specified rather than its slope or logarithmic slope. Such a boundary condition appears to be convenient for treatment of the ionization process because, in principle, a boundary function can be built up by linear combination of inside solutions. Explicit treatments of potential and multichannel scattering are given as well as a numerical application to a model problem to demonstrate the method.
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P. L. Altick (1988) studied this question.
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