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The behavior of scattering cross sections near an excitation threshold is examined for the case of long-range potentials. The theory is confirmed by computations of e-Li scattering. Recent observations of threshold structure in e-Na collisions are ascribed to a ¹D resonance of Na^-. A true cusp should occur only in the ¹P partial cross section.
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Bardsley et al. (1973) studied this question.
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