TEXS: in-vacuum tender X-ray emission spectrometer with 11 Johansson crystal analyzers
Mauro Rovezzi, Alistair Harris, Blanka Detlefs, Timothy Bohdan, Artem Svyazhin, Alessandro Santambrogio, David Degler, Rafal Baran, Benjamin Reynier, Pedro Noguera Crespo, Catherine Heyman, Hans-Peter Van Der Kleij, Pierre Van Vaerenbergh, Philippe Marion, Hugo Vitoux, Christophe Lapras, Roberto Verbeni, Menhard Menyhert Kocsis, Alain Manceau, Pieter Glatzel
Abstract
The design and first results of a large-solid-angle X-ray emission spectrometer that is optimized for energies between 1.5 keV and 5.5 keV are presented. The spectrometer is based on an array of 11 cylindrically bent Johansson crystal analyzers arranged in a non-dispersive Rowland circle geometry. The smallest achievable energy bandwidth is smaller than the core hole lifetime broadening of the absorption edges in this energy range. Energy scanning is achieved using an innovative design, maintaining the Rowland circle conditions for all crystals with only four motor motions. The entire spectrometer is encased in a high-vacuum chamber that allocates a liquid helium cryostat and provides sufficient space for in situ cells and operando catalysis reactors.