Abstract
Herein, we describe the development of a novel dual air-bearing fixed-χ diffractometer for beamline I19 at Diamond Light Source. The diffractometer is designed to facilitate the rapid data collections possible with a Dectris Pilatus 2M pixel-array photon-counting detector, while allowing remote operation in conjunction with a robotic sample changer. The sphere-of-confusion is made as small as practicably possible, through the use of air-bearings for both the ω and φ axes. The design and construction of the new instrument is described in detail and an accompanying paper by Johnson et al. (also in this issue) will provide a user perspective of its operation.
Highlights
Introduction and BackgroundSmall-molecule single-crystal diffraction techniques have evolved rapidly since the late 1960s.Data collection has advanced from laborious film-based techniques, through the use of computer-automated serial detector-based diffractometers, to modern diffraction systems based on CCD detectors
To improve the likelihood of developing a multi-axis goniometer with the required mechanical stability, a fixed-χ geometry was adopted for the design which dispenses with the complexities of a κ-instrument. This loses some of the orientational flexibility offered by a κ-goniometer, the fixed-χ geometry does provide sufficient access to reciprocal space such that complete and redundant data sets can be harvested for all crystal systems [8,9]
The periscope assembly is braced to the on-axis viewer (OAV) base plate via a set of tensioned springs with the Shutter and Beam Diagnostic Assembly; the Beam Defining Slits; and the Attenuators block of the assembly floating on micrometre threaded screws
Summary
Small-Molecule Single-Crystal X-ray Diffraction on Beamline I19 at Diamond Light Source. Allan 1, *, Harriott Nowell 1 , Sarah A. Warren 1 , Adrian Wilcox 1 , Jeppe Christensen 1 , Lucy K. Saunders 1 ID , Andrew Peach 1 , Mark T. Hooper 1 , Ljubo Zaja 1 , Suren Patel 1 , Leo Cahill 1 , Russell Marshall 1 , Steven Trimnell 1 , Andrew J. Foster 1 , Trevor Bates 1 , Simon Lay 1 , Mark A. Hathaway 1 , Graeme Winter 1 , Markus Gerstel 1 ID and Ron W. Received: 17 October 2017; Accepted: 29 October 2017; Published: 2 November 2017
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