The consequence of dosing high energy electrons on a specimen to imaging or obtain spectroscopic information plays an increasing role in operando and in situ electron microscopy. High energy electrons interacts with both specimen and the surrounding gas molecules. This ultimately results in beam induced effects and thus complicate the scientific understanding of a catalytic experiment significantly. Low dose imaging by using a direct electron camera is one way to decrease the required number of electrons to acquire a “good” image. Such a camera was very recently purchased and made available to VISION research.
In
order to make experiments compariable and trustworthy, we envision the need in operando
electron microscopy to measure and document the electron dose as a function of
time, and position on the specimen.
Your task will be to develop a system that can acquire beam and sample position
information and reconstruct/map the electron dose history of a specimen during
experiments.
Your work will be an important contribution to the ambitious efforts in DTU Physics’s new VISION center for visualizing catalyst processes at the atomic-scale. The work will partly be conducted at the unique electron microscopy facility at Haldor Topsoe A/S.
