Collisional quenching of the $A^2\Sigma^+(v’=2)\mathrm{HF}^+$ state by $\mathrm{He}$ atoms

Results of an experimental study of the process of quenching of excited states of $\mathrm{HF}^+$ ions in a hydrofluoride-helium electron-beam plasma are reported. The rate constant of quenching of $A^2\Sigma^+(v’=2)\mathrm{HF}^+$ by helium atoms is measured. The ions were excited by activation of the rarefied gas mixture by an electron beam. Diagnostics of internal states of the ions was performed using the electron-vibration-rotation spectrum of their spontaneous emission.