In-situ chemistry studies for µSR | 9/17/2019 | Staff
kringkring (Posted by) Level 4
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Because of the chemical analogy between muonium (a bound muon-electron system) and hydrogen, the muon technique offers a valuable method for exploring many mechanisms in chemistry and chemical physics. The technique provides information on molecular structure, dynamics and reaction kinetics that complement results obtained from other experimental methods. However, additional information can be obtained by the application of pulsed techniques, such as radio-frequency (RF) and laser excitation, and there was therefore a desire to make these routinely available to experimenters.

The setup for many of these chemistry experiments is challenging, and therefore part of the work of Task 7.4 in SINE2020's Sample Environment work package has been to consider the workflow of a chemistry experiment, developing new equipment as required to improve both data quality and reliability of these types of measurements.

Measurements - Systems - Deoxygenation - Liquid - Handling

To help with sample handling for the measurements, reliable systems for sample deoxygenation and liquid handling have been developed. These make it easy for experimenters to prepare and load samples either in-situ or ex-situ. A chemistry center stick for an existing 4He cryostat was recommissioned and a ceramic cell designed to enable RF measurements to be carried out over a very wide temperature range (-270˚C to room temperature).

However, one of the main improvements has been the development of a chemistry insert optimized for handling liquids. Taking advantage of the geometry of the EMU spectrometer, the new equipment has been configured to mount horizontally (rather than vertically) within the instrument. This helps the samples to flow through the liquid circuit, making it easy to load and unload the cell in-situ, with continuous flow now a possibility for those samples that degrade with time. The equipment incorporates...
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