Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

2011 AAAS Fellow - Cedric Powell

For outstanding contributions to electron spectroscopies of solids, especially in application to quantitative analysis of surfaces and establishment of surface measurement standards.

Created October 19, 2012, Updated May 22, 2017