NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
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.
The nature of chemisorbed CF3I and C2Cl4 on silicon surfaces has been studied using a variety of ultra-high vacuum surface-science techniques, including temperature-programmed desorption and electron-stimulated desorption. Thesticking coefficients for both CF3I and C2Cl4 on 370 K silicon surfaces are near unity. For the CF3I-Si system, SiFx species and I desorb in temperature-programmed desorption. No molecular CF3I desorbs. For the C2Cl4-Si system,SiCl2 desorbs in temperature-programmed desorption. No molecular C2Cl4 desorbs. Low-energy (