The photoionization (PI) spectrum of the ${\mathrm{N}}_2$ molecule is modeled using a first-principles approach combining the multichannel quantum defect theory and electron scattering calculations performed using the uk r-matrix codes. The PI spectra were determined starting from the ground and several excited vibrational levels of ${\mathrm{N}}_2$ in the ground electronic state $X^1{\mathrm{\Sigma }}_g^{+}$. Excited electronic states and vibrational motion of the $\mathrm{N}{{}^{+}}_2$ ion are accounted for. The spectrum obtained for the lowest vibrational level of ${\mathrm{N}}_2$ was compared to the available experimental data. Major resonances in the obtained spectrum were characterized using the quantum defect technique.

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• Electron-ion collisions
• Ionized molecules