Generalized oscillator strengths for the vibronic excitation levels of the b 1πu electronic state of N2 Original Research Article

The limiting behavior of the recently measured generalized oscillator strengths for the individual vibronic excitation levels (v′ = 1–4) of the b 1πu electronic state of N2 at 300 eV electron-impact energy is investigated using various theoretical methodologies. From the excellent agreement between the measurement and the universal formula, we conclude that dynamic effects are insignificant at small scattering angles. The new momentum dispersion formula suggests that the 4-term Lassettre fitting formula is optimal for the four measured transitions and produces optical oscillator strengths that are compatible with those of the experiment.