title: In situ EXAFS, X-ray diffraction and photoluminescence for high-pressure studies.
abstract: A new facility for simultaneous extended X-ray absorption of fine structure (EXAFS), X-ray diffraction and photoluminescence measurements under high pressures has been developed for use on station 9.3 at the Daresbury Laboratory Synchrotron Radiation Source. This high-pressure facility can be used at any suitable beamline at a synchrotron source. Full remote operation of the rig allows simultaneous collection of optical and structural data while varying the pressure. The set-up is very flexible and can be tailored for a particular experiment, such as time- or temperature-dependent measurements. A new approach to the collection of high-pressure EXAFS data is also presented. The approach significantly shortens the experimental times and allows a dramatic increase in the quality of EXAFS data collected. It also opens up the possibility for EXAFS data collection at any pressure which can be generated using a diamond cell. The high quality of data collected is demonstrated with a GaN case study. Particular attention will be paid to the use of energy-dispersive EXAFS and quick-scanning EXAFS techniques under pressure.
authors.affiliation: Solid State Research Centre, De Montfort University, Leicester LE1 9BH, UK. sapelkin@dmu.ac.uk
authors.forename: A V
authors.initials: AV
authors.lastname: Sapelkin
authors.forename: S C
authors.initials: SC
authors.lastname: Bayliss
authors.forename: D
authors.initials: D
authors.lastname: Russell
authors.forename: S M
authors.initials: SM
authors.lastname: Clark
authors.forename: A J
authors.initials: AJ
authors.lastname: Dent