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Instruments / Technical Area	Publication Details	Published	Actions
I21-Resonant Inelastic X-ray Scattering (RIXS)	Probing electron-phonon interactions away from the Fermi level with resonant inelastic x-ray scattering C. D. Dashwood , A. Geondzhian , J. G. Vale , A. C. Pakpour-Tabrizi , C. A. Howard , Q. Faure , L. S. I. Veiga , D. Meyers , G. S. Chiuzbaian , A. Nicolaou , N. Jaouen , R. B. Jackman , A. Nag , M. Garcia-Fernandez , Ke-Jin Zhou , A. C. Walters , K. Gilmore , D. F. Mcmorrow , M. P. M. Dean Physical Review X 11 DOI: 10.1103/PhysRevX.11.041052 Diamond Proposal Number(s): [22695] Open Access Show Abstract ▼ Abstract: Interactions between electrons and lattice vibrations are responsible for a wide range of material properties and applications. Recently, there has been considerable interest in the development of resonant inelastic x-ray scattering (RIXS) as a tool for measuring electron-phonon ( e -ph) interactions. Here, we demonstrate the ability of RIXS to probe the interaction between phonons and specific electronic states both near to, and away from, the Fermi level. We perform carbon K -edge RIXS measurements on graphite, tuning the incident x-ray energy to separately probe the interactions of the π ∗ and σ ∗ electronic states. Our high-resolution data reveal detailed structure in the multiphonon RIXS features that directly encodes the momentum dependence of the e -ph interaction strength. We develop a Green’s-function method to model this structure, which naturally accounts for the phonon and interaction-strength dispersions, as well as the mixing of phonon momenta in the intermediate state. This model shows that the differences between the spectra can be fully explained by contrasting trends of the e -ph interaction through the Brillouin zone, being concentrated at the Γ and K points for the π ∗ states while being significant at all momenta for the σ ∗ states. Our results advance the interpretation of phonon excitations in RIXS and extend its applicability as a probe of e -ph interactions to a new range of out-of-equilibrium situations.	Dec 2021
I20-EDE-Energy Dispersive EXAFS (EDE)	A novel fuel cell design for operando energy-dispersive X-ray absorption measurements Andrew S. Leach , Jennifer Hack , Monica Amboage , Sofia Diaz-Moreno , Haoliang Huang , Patrick L. Cullen , Martin Wilding , Emanuele Magliocca , Thomas Miller , Christopher Howard , Daniel Brett , Paul Shearing , Paul F. Mcmillan , Andrea E. Russell , Rhodri Jervis Journal Of Physics: Condensed Matter DOI: 10.1088/1361-648X/ac0476 Diamond Proposal Number(s): [22008, 15650] Open Access Show Abstract ▼ Abstract: A polymer electrolyte fuel cell (PEFC) has been designed to allow operando X-ray absorption spectroscopy (XAS) measurements of catalysts. The cell has been developed to operate under standard fuel cell conditions, with elevated temperatures and humidification of the gas-phase reactants, both of which greatly impact the catalyst utilisation. X-ray windows in the endplates of the cell facilitate collection of XAS spectra during fuel cell operation while maintaining good compression in the area of measurement. Results of polarisation curves and cyclic voltammograms (CVs) showed that the operando cell performs well as a fuel cell, while also providing XAS data of suitable quality for robust XANES analysis. The cell has produced comparable XAS results when performing a cyclic voltammogram to an established in situ cell when measuring the Pt LIII edge. Similar trends of Pt oxidation, and reduction of the formed Pt oxide, have been presented with a time resolution of 5 seconds for each spectrum, paving the way for time-resolved spectral measurements of fuel cell catalysts in a fully-operating fuel cell.	May 2021

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