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A versatile soft x-ray transmission system for time resolved in situ microscopy with chemical contrast
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
2009 (English)In: Ultramicroscopy, ISSN 0304-3991, E-ISSN 1879-2723, Vol. 109, no 9, 1157-1163 p.Article in journal (Refereed) Published
Abstract [en]

We present the design and operation of a versatile soft X-ray   transmission system for time resolved in situ microscopy with chemical   contrast. The utility of the setup is demonstrated by results from   following a corrosion process of iron in saline environment, subjected   to a controlled humid atmosphere. The system includes a transmission   flow-cell reactor that allows for in situ microscopic probing with soft   X-rays. We employ a full field technique by using a nearly collimated   X-ray beam that produces an unmagnified projection of the transmitted   soft X-rays (below 1.1 keV) which is magnified and recorded by an   optical CCD camera. Time lapse series with chemical contrast allow us   to follow and interpret the chemical processes in detail. The   obtainable lateral resolution is a few mu m, sufficient to detect   filiform corrosion on iron.

 

 

 

Place, publisher, year, edition, pages
2009. Vol. 109, no 9, 1157-1163 p.
Keyword [en]
X-ray microscopy, X-ray microscope design and characterization, In situ specimen treatment
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-98009DOI: 10.1016/j.ultramic.2009.05.002ISI: 000269631700008OAI: oai:DiVA.org:uu-98009DiVA: diva2:173164
Available from: 2009-02-06 Created: 2009-02-06 Last updated: 2011-02-23Bibliographically approved
In thesis
1. In Situ Soft X-ray Spectroscopies Applied to Atmospheric Corrosion And Related Systems
Open this publication in new window or tab >>In Situ Soft X-ray Spectroscopies Applied to Atmospheric Corrosion And Related Systems
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis concerns the application of various soft x-ray spectroscopic methods (soft x-ray absorption, SXA, and emission, SXE) to complex, non-vacuum compatible systems, including liquids and multi-phase systems.

The design, construction, and application of new instrumentation for in situ spectroscopy is described in detail. This includes sample holders using thin soft x-ray transparent membranes to enable measurements on systems completely isolated from vacuum, enabling flow of e.g. liquid or gas. In particular, a versatile setup for time resolved in situ chemical contrast x-ray transmission microscopy (CCXTM) was constructed and implemented. These instruments are expected to be applicable to a wide range of situations, for example in situ studies of chemical reactions, or biological specimen.

The main project concerns atmospheric corrosion of iron in a saline environment, a process that requires the simultaneous presence of the solid (iron, NaCl), liquid (water) and gaseous (air) phases. It is also a highly inhomogeneous process, where lateral and time resolution is important. Using the CCXTM instrumentation, we were able to follow the distribution of all present elements over the sample with time resolution of a few minutes, and also to extract significant chemical information from the absorption edges. We observed e.g. the initial formation of corrosion products and transport of chlorine.

Results from SXE measurements on water molecules in micelle structures are presented. A comparison with calculations reveal influence from the counter-ions, but also some spectral changes that may be attributed to water confinement.

Also presented are angle dependent soft x-ray emission of liquid water, measuring scattered x-rays from different directions respect to the incident x-ray polarization. Existing preliminary theoretical expectations for the polarization dependence are contradictory. Our experiments show that a small angular anisotropy seems to be retained from the free molecule case.

Place, publisher, year, edition, pages
Uppsala: Universitetsbiblioteket, 2009. ix, 85 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 595
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-9540 (URN)978-91-554-7397-6 (ISBN)
Public defence
2009-02-27, Häggsalen, Ångström Laboratory, Lägerhyddsvägen 1, Polacksbacken, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2009-02-06 Created: 2009-02-06 Last updated: 2010-05-05Bibliographically approved

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Forsberg, Johan

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