Role of resonances in the electron-impact excitation functions of theC Πu3andE Σg+3states ofN2

Resonances in $e^{-}-{\mathrm{N}}_2$ scattering have been studied from about 11 to 16 eV by simultaneous measurement of the transmitted electron spectrum, and both the prompt and delayed emission functions for the $C {}_{}{}^3{}_{}{}^{}\Pi _u^{}{}_{}{}^{}\to B {}_{}{}^3{}_{}{}^{}\Pi _g^{}{}_{}{}^{}\mathrm{}(0,0)\mathrm{}$ transition. In this energy domain 28 structures have been observed, 25 of which have been observed in both the electron transmission spectrum and the total optical excitation function. The delayed emission in this energy range is attributed to the decay of the various states of $\mathrm{N}_2^{}{}_{}{}^{-}$ to the $E {}_{}{}^3{}_{}{}^{}\Sigma _g^{{}^{+}}{}_{}{}^{}$ state of ${\mathrm{N}}_2$ which is collisionally de-excited to the $C {}_{}{}^3{}_{}{}^{}\Pi _u^{}{}_{}{}^{}$ state of ${\mathrm{N}}_2$. Negative-ion resonances which decay to both the $E {}_{}{}^3{}_{}{}^{}\Sigma _g^{+}{}_{}{}^{}$ and $C {}_{}{}^3{}_{}{}^{}\Pi _u^{}{}_{}{}^{}$ contribute strongly to the 3371 emission in this energy domain.