Collisional quenching of He2 molecules in the a 3Σ+u level by impurity gases

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Abstract
Measurements in a fast pulsed discharge of the room temperature rate constant for the quenching of He2 molecules in the metastable a 3Σ+u level by Ar, N2, O2, H2, and CO2 are reported at He pressures of 200 and 300 Torr and for various pressures of the impurity gas. The concentration of He2 molecules in the a 3Σ+u level is monitored by using a pulsed dye laser to excite the Q5 line of the e 3πg←a 3Σ+u transition and by observing the subsequent d 3Σ+u→b 3πg fluorescence. The results for N2, Ar, and CO2 are combined with previous data of others to obtain both bimolecular and termolecular rate constants for the quenching of the a 3Σ+u level.