A variational treatment of the R matrix method for multichannel scattering is given, in which basis functions used for expanding the wave function within a boundary radius r₀ need not satisfy specific boundary conditions at r₀. As an illustration, a simple basis set of monomial functions (rⁿ,n=1,,N) is used in a two-channel-model problem with long-range potentials. Excellent results are obtained with ten such functions in each channel.
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Oberoi et al. (1973) studied this question.
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