Stereodynamics experiments of Ne(P) reacting with Ar, Kr, Xe, and N leading to Penning and associative ionization have been performed in a crossed molecular beam apparatus. A curved magnetic hexapole was used to state-select and polarize Ne(P) atoms which were then oriented in a rotatable magnetic field and crossed with a beam of Ar, Kr, Xe, or N. The ratio of associative to Penning ionization was recorded as a function of the magnetic field direction for collision energies between 320 cm and 500 cm. Reactivities are obtained for individual states that differ only in Ω, the projection of the neon total angular momentum vector on the inter-particle axis. The results are rationalized on the basis of a model involving a long-range and a short-range reaction mechanism. Substantially lower probability for associative ionization was observed for N, suggesting that predissociation plays a critical role in the overall reaction pathway.
The stereodynamics of the Ne( 3 P2)+Ar Penning and Associative ionization reactions have been studied using a crossed molecular beam apparatus. The experiment uses a curved magnetic hexapole to polarise the Ne( 3 P2) which is then oriented with a shaped magnetic field in the region where it intersects with a beam of Ar( 1 S). The ratios of Penning to associative ionization were recorded over a range of collision energies from 320 cm −1 to 500 cm −1 and the data was used to obtain Ω state dependent reactivities for the two reaction channels. These reactivities were found to compare favourably to those predicted in the theoretical work of Brumer et al.
We report on an experimental investigation of the low-energy stereodynamics of the energy transfer reactions Ne(3P2) + X, producing Ne(1S) + X+ and [Ne–X]+ (X = N2 or CO). Collision energies in the range 0.2 K–700 K are obtained by using the merged beam technique. Two kinds of product ions are generated by Penning and associative ionization, respectively. The intermediate product [Ne–X]+ in vibrationally excited states can predissociate into bare ions (X+). The experimental ratio of the NeX+ and X+ product ion yields is similar for both molecules at high collision energies but diverge at collision energies below 100 K. This difference is explained by the first excited electronic state of the product ions, which is accessible in the case of CO but lies too high in energy in the case of N2.
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