Quenching of krypton atoms in the metastable 5s (3P2) state in collisions with krypton and helium atoms

We have used the absorption probe method to study the processes of collisional quenching of the metastable 5s [3/2]^o₂(³P₂) state of the krypton atom in electron-beam-excited high-pressure He – Kr mixtures with a low content of krypton. The rate constants of plasma-chemical reactions Kr* + Kr + He → Kr*2+He [(2.88 ± 0.29) × 10^-33 cm⁶ s^-1], Kr* + 2He → HeKr* + He [(4.6 ± 1.3) × 10^-36 cm⁶ s^-1] and Kr* + He → products + He [(1.51 ± 0.15) × 10^-15 cm³ s^-1] are measured for the first time. The rate constants of similar reactions in the Ar – Kr mixture are refined.