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Sean D. S. Gordon

Publications and source records attributed to Sean D. S. Gordon.

2 recordsLinked to original sources
arXiv2017

Energy dependent stereodynamics of the Ne($^3$P$_2$)+Ar reaction

The stereodynamics of the Ne($^3$P$_2$)+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($^3$P$_2$) 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.

physics.chem-ph↗
arXiv2017

3D printed beam splitter for polar neutral molecules

We describe a macroscopic beam splitter for polar neutral molecules. A complex electrode structure is required for the beam splitter which would be very difficult to produce with traditional manufacturing methods. Instead, we make use of a nascent manufacturing technique: 3D printing of a plastic piece, followed by electroplating. This fabrication method opens a plethora of avenues for research, since 3D printing imposes practically no limitations on possible shapes, and the plating produces chemically robust, conductive construction elements with an almost free choice of surface material; it has the added advantage of dramatically reduced production cost and time. Our beam splitter is an electrostatic hexapole guide that smoothly transforms into two bent quadrupoles. We demonstrate the correct functioning of this device by separating a supersonic molecular beam of ND3 into two correlated fractions. It is shown that this device can be used to implement experiments with differential detection wherein one of the fractions serves as a probe and the other as a reference. Reverse operation would allow to merging of two beams of neutral polar molecules.

physics.chem-ph↗