What is it about?

During irradiation with hydrogen plasma, simultaneous measurements of the gas-phase ESR signals of atomic hydrogen and the carbon dangling bond (C-DB) on poly(tetrafluoroethylene) (PTFE) using in situ real-time electron spin resonance (ESR) measurements were performed. Synergistic irradiation with both vacuum ultraviolet (VUV) and atomic hydrogen enhances to form C-DBs.

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Why is it important?

For the development of green chemical processes, electrical discharge, known as cold plasma, rather than hot plasma, is beneficial for nuclear fusion reactors on both the laboratory and industrial scales. However, chemical reactions under plasma are very complicated, due to the simultaneous irradiation of electrons, ions, radicals, and photons. Therefore, the individual contributions of each of these reactive species in the plasma must be elucidated.


During atomic H exposure, the ESR spectra exhibited C-DB signals. The in situ real-time ESR technique was demonstrated as a new experimental approach to the microscopic understanding of chemical reactions on surfaces with gaseous radicals during plasma processes. We have successfully obtained information regarding the reaction mechanism with radicals generated by plasma-induced surface interactions.

Dr Kenji Ishikawa
Nagoya University

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This page is a summary of: Synergistic Formation of Radicals by Irradiation with Both Vacuum Ultraviolet and Atomic Hydrogen: A Real-Time In Situ Electron Spin Resonance Study, The Journal of Physical Chemistry Letters, June 2011, American Chemical Society (ACS), DOI: 10.1021/jz2002937.
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