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An analytic method that exploits the properties of the eigenphase sum and its derivative is developed and implemented to study resonance structure found in the phase shift for electron scattering by diatomic molecular cations. The approach is used to locate narrow resonances and identify interloper resonances found within dominant Rydberg series. The power of the technique is illustrated for two molecular cations (oxygen and titanium oxide).
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Ballance et al. (1999) studied this question.
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