期刊
JOURNAL OF SYNCHROTRON RADIATION
卷 28, 期 -, 页码 1845-1849出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600577521009942
关键词
oxygen K-edge X-ray absorption spectroscopy; spectroscopy of liquids; X-ray windows; oxygen contamination
资金
- Chevron Energy Technology Company
- Natural Sciences and Engineering Research Council of Canada [RGPIN-2016-05810, RGPIN-2019-05351]
- Canada Research Chairs
- US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
Oxygen K-edge X-ray absorption spectroscopy is commonly used for studying solid materials, but studying liquid samples faces challenges of high-vacuum conditions and oxygen contamination. A new modular sample holder design allows for encapsulating liquid samples under high-vacuum conditions and provides a protocol for minimizing background oxygen contamination.
Oxygen K-edge X-ray absorption spectroscopy is used routinely to study a range of solid materials. However, liquid samples are studied less frequently at the oxygen K-edge due to the combined challenges of high-vacuum conditions and oxygen contamination of window materials. A modular sample holder design with a twist-seal sample containment system that provides a simple method to encapsulate liquid samples under high-vacuum conditions is presented. This work shows that pure silicon nitride windows have lower oxygen contamination than both diamond- and silicon-rich nitride windows, that the levels of oxygen contamination are related to the age of the windows, and provides a protocol for minimizing the background oxygen contamination. Acid-washed 100nm-thick silicon nitride windows were found to give good quality oxygen K-edge data on dilute liquid samples.
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