Abstract
We present a summary of recent progress on studies of threshold phenomena in low-energy dissociative electron attachment to polyatomic molecules: vibrational Feshbach resonances and threshold cusps. The theoretical approach is based on the resonance R-matrix theory. It allows us to analyze threshold effects in other channels, particularly vibrational excitation. If the molecular long-range field is not strong enough, virtual-state cusps are observed at vibrational excitation thresholds. The second part of the paper illustrates the multimode effects in dissociative attachment using attachment to the CF3Cl molecule as an example. Symmetric stretch C-Cl vibrations v3 and symmetric deformation (or so-called "umbrella") vibrations v2 are included. Calculations allow us to study the final-state vibrational distribution in the CF3(v2) fragment.
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