Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Charles S Tarrio (Fed)

Charlie Tarrio received a BS from Bates College in Lewiston, ME, with high honors in physics. He received his PhD in physics from the University of Virginia in Charlottesville under the guidance of Steve Schnatterly. He used electron energy-loss spectroscopy to study electronic and optical properties of a diverse set of materials including superconductors and rare-gas solids. He has been at NIST since 1991. His primary interest is in properties of materials under illumination by vacuum ultraviolet radiation. These include optical constants, mirror reflectivities, susceptibility to environmental contamination, and radiation damage. He's developed several new tools and techniques on the Synchrotron Ultraviolet Radiation Facility. Current tools are described in the links below.

Research Interests


  • DOC Silver Medal, 2012
  • William P. Slichter Award, 2007
  • DOC Silver Medal, 2004
  • Arthur S. Flemming Award in Applied Science, 2003
  • DOC Bronze Medal, 1994


Measurements and model of UV-induced oxidation of aluminum

Robert F. Berg, Charles S. Tarrio, Thomas B. Lucatorto
We present measurements and a model of aluminum oxidation induced by ultraviolet (UV) radiation. Spots of oxide were grown by focusing synchrotron radiation

The hazard of UV-induced oxidation to solar-viewing spacecraft optics

Charles S. Tarrio, Robert F. Berg, Thomas B. Lucatorto, Dale E. Newbury, Nicholas Ritchie, Andrew Jones, Frank Eparvier
The two most prevalent outgas contaminants on satellites are organic molecules and water vapor. Adsorbed organic molecules can degrade a solar-viewing
Created October 9, 2019, Updated December 8, 2022