Events Calendar

Dr. Ian Coulthard Lecture Sponsored by SWC & Chemistry Dept.

Date:
Tuesday, December 12, 2017
Time:
2:00 pm - 3:00 pm
Location:
Chemistry Building (CHB)
Room: 115
Cost:
Free

Dr. Ian Coulthard
Canadian Light Source (CLS)

will present a talk entitled:

“How Far Can High Energy Resolution Fluorescence Detection (HERFD) XAS Take Us?”

ABSTRACT:

There is an ever-increasing need for the ability to perform X-ray absorption spectroscopy (XAS) under conditions that are “scientifically relevant”.  This broadly defined term of “scientifically relevant” may apply to a number of experimental conditions/capabilities that can include sample form, sample concentration, sample environment, spectral resolution, spatial specificity, chemical specificity, and temporal specificity.  Over the last 25 years, there has been considerable progress made in providing the necessary tools and techniques for “scientifically relevant” XAS.  These efforts have focused upon providing x-ray sources with increased flux/brilliance, improving the collection and signal processing capacity of detectors, and detection schemes that vastly improve signal to noise ratios.

Here we report on HERFD X-ray absorption spectroscopy, which has shown remarkable improvements in spectral resolution compared to conventional XAS resulting in exceptional chemical specificity.  In addition, the HERFD XAS technique has also demonstrated great potential with respect to the detection of trace levels of elements and for usage in time-resolved XAS studies.  Some examples of HERFD XAS used to study selenium and mercury at naturally occurring levels in wild fish will be presented.  The potential to expand HERFD XAS beyond its current limits of usage shall be discussed as well as the challenges inherent in HERFD XAS and other brilliance intensive experimental techniques in general.

Host:
Soochow Western Centre for Synchrotron Radiation Research and the Department of Chemistry
Contact:
T.K. Sham - Professor
tsham@uwo.ca
Event Type:


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