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Temporal Evolution of Surface Contamination under Ultra-high Vacuum
Name
_Temporal Evolution of Surface Contamination Under Ultra-High Vacuum.pdf
Description
Accepted version
Size
428.94 KB
Format
Adobe PDF
Checksum (MD5)
30409f7be6077599ebd4cb2c1f974184
Author(s)
Liu, Zhen
Song, Youngsup
Rajappan, Anoop
Wang, Evelyn N
Preston, Daniel J
Date Issued
January 25, 2022
Journal
Langmuir
Publisher
American Chemical Society (ACS)
Citation
Liu, Zhen, Song, Youngsup, Rajappan, Anoop, Wang, Evelyn N and Preston, Daniel J. 2022. "Temporal Evolution of Surface Contamination under Ultra-high Vacuum." Langmuir, 38 (3).
Version
Author's final manuscript
Abstract
Ultra-high vacuum (UHV) is essential to many surface characterization techniques and is often applied with the intention of reducing exposure to airborne contaminants. Surface contamination under UHV is not well-understood, however, and introduces uncertainty in surface elemental characterization or hinders surface-sensitive manufacturing approaches. In this work, we investigated the time-dependent surface composition of gold samples with different initial levels of contamination under UHV over a period of 24 h with both experiments and physical modeling. Our results show that surface hydrocarbon concentration under UHV can be explained by molecular adsorption-desorption competition theory. Gold surfaces that were initially pristine adsorbed hydrocarbons over time under UHV; conversely, surfaces that were initially heavily contaminated desorbed hydrocarbons over time. During both adsorption and desorption, the concentration of contaminants tended toward the same equilibrium value. This study provides a comprehensive evaluation of the temporal evolution of surface contamination under UHV and highlights routes to mitigate surface contamination effects.
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
10.1021/acs.langmuir.1c03062
