The scattering engine

The model-independent solver and the time-independent routes to a cross section.

• qscat.core + qscat.model: the electron–diatomic VE-scattering engine
• N₂ electron-impact ²Π_g shape resonance: fixed-R pole search
• N₂ vibrationally-elastic/inelastic cross section: TI resolvent/driven-equation method
• N₂ vibrationally-elastic/inelastic cross section: exact 2-D driven-equation method
• NRM vibrational excitation

• qscat.core + qscat.model: the electron–diatomic VE-scattering engine — the model-independent engine and the model/engine split it enforces.

• N₂ electron-impact ²Π_g shape resonance: fixed-R pole search — locating the resonance pole.

• N₂ vibrationally-elastic/inelastic cross section: TI resolvent/driven-equation method — the one-dimensional time-independent route.

• N₂ vibrationally-elastic/inelastic cross section: exact 2-D driven-equation method — the exact two-dimensional driven solve, gated against independent published data.

• NRM vibrational excitation — the nonlocal resonance model’s vibrational-excitation route: two-potential background + resonant T-matrices on the shared nonlocal kernel, reproducing the exact solver to better than 0.7 % on N₂ and F₂.