Bimolecular and ’’three-body’’ quenching of resonance state argon atoms by nitrogen at argon pressures in the 200–700 torr region

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Abstract
Measurements of effects of the partial pressures of N2 and Ar on the decay rates of Ar(1P1) and Ar(3P1) atoms in Ar/N2 mixtures at PAr from 200 to 700 torr at 296 K indicate that the quenching efficiency of N2 increases with increasing argon pressure. It is suggested that quenching of transient, dissociative, vibrationally excited argon excimers by N2 is responsible for this observation. Rate constants for direct bimolecular quenching of Ar(1P1) and Ar(3P1) by N2 are 2.07 (±0.09)10−11 and 1.29(±0.14)10−11 cm3 molecule−1 s−1, respectively. Rate constants for quenching of dissociative, vibrationally excited excimer species associated with Ar(1P1) and Ar(3P1) decay channels are estimated to be equal to 3.3×10−9 and 2.4×10−9 cm3 molecule−1 s−1, respectively.