The threshold laws for electron-atom scattering processes in a magnetic field are shown not to contain singularities in general. Observed modulations of photodetachment cross sections are due to the presence of true resonances rather than divergence of phase space. These resonances may be associated with thresholds, or they may be analogous to the quasi-Landau resonances observed in photoionization.
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Charles W. Clark (1983) studied this question.
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