Several years ago, the Chemistry and Geosciences Departments, with support from the College of Science, pooled their instrumentation and personnel in the Virginia Tech Crystallography Laboratory (VTX). VTX operates five diffractometers and is equipped to collect data on a broad range of single-crystal samples (e.g. small molecules, frameworks, minerals, and proteins). The Chemistry Department routinely uses two diffractometers (1) the Rigaku Oxford-Diffraction Gemini equipped with dual X-ray sources (Cu and Mo) and low temperature capability (down to 100 K) and (2) the Rigaku Oxford-Diffraction Nova equipped with a high-intensity Cu-microsource and low temperature capability (100 K) and suitable for proteins and small or poorly diffracting chemistry samples. Services provided include:
Crystal screening and mounting, including air-sensitive samples.
Structure solution, refinement, and interpretation.
Cambridge Crystallographic Database searching.
Please note that while powder diffraction is possible using VTX equipment, the diffractometers are designed for single crystal samples. Other techniques, including powder diffraction and fiber diffraction, are considered ‘specialized’ and are only offered by special request and with adequate justification for the need of the single crystal instruments as opposed to instruments specifically designed for such experiments.
VTX also has the unusual capability to collect in-situ high-pressure single crystal data (up to 10 GPa). These experiments are highly specialized and are only offered through research collaboration.