Welcome to a hybrid seminar with LINXS new Guest fellow Prof. Adam Hitchcock.
We will also open up the seminar for digital participation. Please remember to mark in the registration how you plan to participate.
When: Thursday, October 14, 15.00 - 16.00 CET
How: Please fill out the registration form. We will provide a zoom link to everybody who has signed up for digital participation.
Who: Prof. Adam Hitchcock, McMaster University, Hamilton (Ontario), Canada
Title: Chemically sensitive imaging with synchrotron based soft X-ray STXM and ptychography
Bio
Adam Hitchcock was born and educated in Canada (B.Sc., Chemistry, McMaster, 1974; Ph.D., Chemical Physics, UBC, 1978). His research focus is inner shell excitation spectroscopies and spectromicroscopies. A professor at McMaster since 1979, his group has studied inner shell electron energy loss (EELS) spectroscopy of gases and surfaces, using home built instruments. In 1980 he started synchrotron experiments, initially hard X-ray spectroscopy of materials at Cornell (USA), then soft X-ray spectroscopy of gases at LURE (France) and SRC (USA). In 1994 he began developing soft X-ray transmission microscopes (STXM) and photoemission microscopes (PEEM) at ALS (USA). He helped establish the Canadian Light Source (CLS, Saskatoon) and the CLS spectromicroscopy beamline, currently equipped with 2 STXMs and a PEEM. In 2006, he was awarded fellowship of the Royal Society of Canada (FRSC, Canada’s highest scientific honor), for his contributions to development of X-ray microscopy and the CLS. His current research is focused on technique developments of STXM and ptychography and their application to automotive fuel cell materials, in situ electrochemistry, magnetic bacteria, and catalysts for CO2 reduction.
Abstract
Soft X-ray scanning transmission microscopy (STXM) is a powerful synchrotron based tool for nanoscale materials analysis. Ptychography (scanning coherent diffraction imaging) which can be measured using soft X-ray STXMs, provides significant improvements in spatial resolution (~10 nm, as opposed to 20-30 nm for conventional STXM). Quantitative 3D imaging (tomography) at multiple photon energies – can be performed with STXM and ptychography. Principles of STXM and ptychography will be described, with emphasis on spectromicroscopy - X-ray absorption spectroscopy (NEXAFS) and chemical mapping by imaging at multiple photon energies. Applications in biosciences (magnetotactic bacteria), energy materials (fuel cells, CO2 reduction catalysts) and in situ electrochemical studies will be presented.