The VERSOX beamline at Diamond provides soft X-rays between 50 and 2800 eV for studying atomic structures and the electronic/chemical properties of surfaces and interfaces by X-ray Photoelectron Spectroscopy (XPS) and Near-Edge X-ray Absorption Spectroscopy (NEXAFS) under wide-ranging pressures and temperatures. The beamline has separate sources and optical components to allow independent and parallel operation of two branch lines: B07-C (Ambient Pressure) and B07-B (High Throughput). Branch C has been operating since mid-2017 and Branch B is scheduled to begin user operations in mid-2019. The ambient pressure endstation on Branch C is a modular system that allows maximum flexibility with respect to sample environments. The system concept is based on an interface flange which combines the entrance nozzle of the electron energy analyser and the beamline interface, both of which are differentially pumped, and exchangeable reaction/experiment cells for experiments up to a maximum pressure of ~50 mbar. The beamline optics of Branch C are optimised for X-rays in the range 250 – 2800 eV. Branch B has two focal points: a high-throughput UHV XPS endstation, and a separate endstation for ambient pressure (up to 1000 mbar) XAS experiments. The beamline optics of Branch B are optimised for X-rays in the range 50 – 2200 eV, with an aim to study advanced materials under realistic ambient conditions as well as probing liquid-solid and liquid-gas interfaces. In this presentation I will outline the current capabilities and applications of VERSOX as well as future developments.

B07: Versatile soft X-ray beamline (VERSOX) at diamond light source

2019 Fall National Meeting

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