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Instruments / Technical Area	Publication Details	Published	Actions
	Energy dispersive XAFS: characterization of electronically excited states of copper(I) complexes Moniek Tromp , Andrew J. Dent , Jon Headspith , Timothy Easun , Xue-Zhong Sun , Michael George , Olivier Mathon , Grigory Smolentsev , Michelle L. Hamilton , John Evans The Journal Of Physical Chemistry B 117 (24), 7381 - 7387 DOI: 10.1021/jp4020355 PMID: 23718738 Open Access Show Abstract ▼ Abstract: Energy dispersive X-ray absorption spectroscopy (ED-XAS), in which the whole XAS spectrum is acquired simultaneously, has been applied to reduce the real-time for acquisition of spectra of photoinduced excited states by using a germanium microstrip detector gated around one X-ray bunch of the ESRF (100 ps). Cu K-edge XAS was used to investigate the MLCT states of [Cu(dmp)2]+ (dmp =2,9-dimethyl-1,10-phenanthroline) and [Cu(dbtmp)2]+ (dbtmp =2,9-di-n-butyl-3,4,7,8-tetramethyl-1,10-phenanthroline) with the excited states created by excitation at 450 nm (10 Hz). The decay of the longer lived complex with bulky ligands, was monitored for up to 100 ns. DFT calculations of the longer lived MLCT excited state of [Cu(dbp)2]+ (dbp =2,9-di-n-butyl-1,10-phenanthroline) with the bulkier diimine ligands, indicated that the excited state behaves as a Jahn–Teller distorted Cu(II) site, with the interligand dihedral angle changing from 83 to 60° as the tetrahedral coordination geometry flattens and a reduction in the Cu–N distance of 0.03 Å.	Jun 2013
Detectors	Detectors for energy-dispersive EXAFS (EDE) experiments Giuseppe Salvini , Jon Headspith , Stephen L. Thomas , Gareth Derbyshire , Andrew Dent , Trevor Rayment , John Evans , Richard Farrow , Sofia Diaz-Moreno , Cyril Ponchut Nuclear Instruments And Methods In Physics Research Section A: Accelerators, Spectrometers, Detectors And Associated Equipment 551, 27 - 34 DOI: 10.1016/j.nima.2005.07.039 Show Abstract ▼ Abstract: EXAFS, X-ray absorption spectroscopy fine structure, has been an important tool within synchrotron radiation science for some years. It has been used extensively in step scanning mode to provide information on the local environment within both static and slowly changing samples. Energy-dispersive EXAFS (EDE) allows similar information to be collected in a significantly shorter time frame, enabling the study of truly dynamically changing samples. The technique uses a bent crystal monochromator to focus an energy-dispersed X-ray beam onto a sample which then impinges upon an array detector positioned behind the sample. This allows the absorption over a range of energies to be collected in a very short period. Until recently only few systems have existed for this technique, typically employing commercially available detectors originally constructed for other applications. These presented limitations in speed, energy resolution, linearity and dynamic range and could only follow changes in the millisecond range. Using UK ESPRC grant funds, a new detector has been developed (XSTRIP) which shows great improvements over the above limitations and has demonstrated the potential to open new areas of science to researchers. This paper will present the technique, some of the historical limitations, the performance increase afforded by the XSTRIP system and an overview of the future direction of detectors for this most exciting and important technique.	Oct 2005

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