Dalton Abdala's webpage

SXS beamline

 

BioXAS

 

Spectrokinetics

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Combining kinetics and spectroscopy to perform time-resolved in-situ studies on enviromental geochemistry (sorpion/desorption and redox reactions) and biology is ideal since spectroscopy can provide direct information on the chemical species present in a system and kinetics can provide insight into the processes that elements and the soil's solid phase undergo as a steady state is approached.

 

The combination of both techniques, termed spectrokinetics, is a result of coupling a stirred-flow reactor to a XAS experimental hutch and allows for the collection of kinetic and spectroscopic information simultaneously at low energies (1.5 to 5 keV), with time resolution down to the minute time-scale and reasonable spectral resolution. With this technique, one is able to follow redox and sorption/desorption reactions at the K-and L2,3-edges of several elements (Al, P, S, K and Ca, Mo, V, Ti).

 

​Inside the XAS experimental chamber, a carousel carried by a continuously moving endless belt is equipped with a three-phase platform with vials sitting over the platform and offset by 120°. Each of these vials have a polyporpilene window that allows the incident X-ray beam to shine on the sample. The vials serve the purpose of loading, measuring and unloading the outlet solution coming out of the stirred-flow reactor.

 

 

 

SXS-XPS

 

X-rays absorption spectroscopy and X-rays photoelectron spectroscopy

 

Combining kinetics and spectroscopy to perform time-resolved in-situ studies on enviromental geochemistry (sorpion/desorption and redox reactions) and biology is ideal since spectroscopy can provide direct information on the chemical species present in a system and kinetics can provide insight into the processes that elements and the soil's solid phase undergo as a steady state is approached