A method for measuring the local gas pressure within a gas-flow stage in situ in the transmission electron microscope

Ultramicroscopy
R ColbyB Kabius

Abstract

Environmental transmission electron microscopy (TEM) has enabled in situ experiments in a gaseous environment with high resolution imaging and spectroscopy. Addressing scientific challenges in areas such as catalysis, corrosion, and geochemistry can require pressures much higher than the ∼20 mbar achievable with a differentially pumped environmental TEM. Gas flow stages, in which the environment is contained between two semi-transparent thin membrane windows, have been demonstrated at pressures of several atmospheres. However, the relationship between the pressure at the sample and the pressure drop across the system is not clear for some geometries. We demonstrate a method for measuring the gas pressure at the sample by measuring the ratio of elastic to inelastic scattering and the defocus of the pair of thin windows. This method requires two energy filtered high-resolution TEM images that can be performed during an ongoing experiment, at the region of interest. The approach is demonstrated to measure greater than atmosphere pressures of N2 gas using a commercially available gas-flow stage. This technique provides a means to ensure reproducible sample pressures between different experiments, and even between very differently d...Continue Reading

References

Apr 5, 2008·Journal of Microscopy·F D'Amico, E Skarmoutsou
Nov 18, 2011·Ultramicroscopy·Tadahiro YokosawaHenny Zandbergen
Mar 31, 2012·Micron : the International Research and Review Journal for Microscopy·Jakob B WagnerThomas W Hansen
May 9, 2012·Micron : the International Research and Review Journal for Microscopy·J R Jinschek, S Helveg
Jul 28, 2012·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Lawrence F AllardJohn Damiano
Sep 10, 2013·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Huolin L XinHaimei Zheng

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