Abstract
The three-body ionic-recombination reaction of Ar+(2P3/2)+Cl−+He has been studied by observing ArCl(B–X,C–A) and Cl(4s,4s′,4p,4p′,4d,5p,6s) emissions in the He flowing afterglow. CCl4 or CFCl3 is used as a source of Cl−. The ArCl(B–X,C–A) emissions enhance relative to the Cl* bands with increasing the CCl4 pressure. It is explained as due to the secondary Ar(3P2)+CCl4 reaction, which is used to estimate the relative formation rate of Ar(3P2). The relative formation rates of ArCl(B,C), Ar(3P2), and Cl* are determined to be 0.0087±0.0009, 0.64±0.06, and 0.35±0.04, respectively. The small branching ratio of ArCl(B,C) is attributed to fast predissociation into Ar(3P2) and Cl*. The favorable Cl* states are 4s′ populated by direct reaction and 4p populated by direct reaction and/or radiative cascade from the 3d and 5s states. The electronic state distribution of Cl(4p′,4d,5p,6s) is nonstatistical without any strong preference for J. Although both doublet and quartet states are found for the Cl[5p(P,D)] states, only quartet states are observed for the Cl[5p(S),4d(D,F)] states.
Published Version
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