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.

Https

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.

Taking Measure

Just a Standard Blog

Charles Tarrio

portrait of Charlie Tarrio

Charlie Tarrio received his BS from Bates College in Lewiston, Maine, and Ph.D. in physics from the University of Virginia. He has been at NIST since 1991 developing at-wavelength EUV metrology and studying properties and contamination of EUV optics.