Journal of Chemical Physics, Vol.101, No.9, 7451-7457, 1994
Electronic-State Distribution of Xe-+asterisk Formed by Excitation Transfer from Ne(P-3(0,2)0) to Xe+(P-2(3/2)0) at Thermal-Energy
The Ne(P-3(0,2)0)+Xe+(5p5 P-2(1/2,3/2)0) excitation-transfer reaction has been studied by observing ultraviolet and visible emissions from Xe-+* in a Ne flowing afterglow. The relative contribution of Xe+(P-2(3/2)0) and Xe+(P-2(3/2)0) to the excitation of Xe-+* was examined by changing the [Xe+(P-2(1/2)0)]/[Xe+(P-2(3/2)0)] ratio with the addition of CH4 as a remover of the upper spin-orbit component. Since the intensity distribution of Xe-+* lines was independent of the [Xe+(P-2(1/2)0)]/[Xe+(P-2(3/2)0)] ratio, it was concluded that the contribution of the Ne(P-3(0,2)0)+Xe+(P-2(1/2)0) reaction was insignificant. The Ne(P-3(0,2)0)+Xe+(P-2(3/2)0) reaction initially populates nine Xe+(6p,6p’,7s,6) levels in the 13.86-16.60 eV range. The favored product levels are 6p’ D-2(3/2,5/2)0 and 7s P-4(5/2) in the 16.36-16.43 eV range and 6p P-4(5/2)0 at 13.88 eV, which are 0.2-0.3 and 2.7 eV below the entrance Ne(P-3(2)0)+Xe+(P-2(3/2)0) channel, respectively. The former near-resonant levels are excited by either direct curve crossings between attractive entrance potentials and flat exit ones or multiple curve crossings through a strongly attractive Ne-+Xe2+ ionic potential, while the latter nonresonant level is probably formed through the Ne-+Xe2+ ionic potential.
Keywords:ION-RECOMBINATION REACTIONS;FLOWING AFTERGLOW;METASTABLE ATOMS;CHARGE-TRANSFER;KRF-STAR;AR+;N-2;SF6