Plasma-induced surface cooling

John A. Tomko (), Michael J. Johnson, David R. Boris, Tzvetelina B. Petrova, Scott G. Walton () and Patrick E. Hopkins ()
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John A. Tomko: University of Virginia
Michael J. Johnson: Syntek Technologies
David R. Boris: Plasma Physics Division, Naval Research Laboratory
Tzvetelina B. Petrova: Plasma Physics Division, Naval Research Laboratory
Scott G. Walton: Plasma Physics Division, Naval Research Laboratory
Patrick E. Hopkins: University of Virginia

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Plasmas are an indispensable materials engineering tool due to their unique ability to deliver a flux of species and energy to a surface. This energy flux serves to heat the surface out of thermal equilibrium with bulk material, thus enabling local physicochemical processes that can be harnessed for material manipulation. However, to-date, there have been no reports on the direct measurement of the localized, transient thermal response of a material surface exposed to a plasma. Here, we use time-resolved optical thermometry in-situ to show that the energy flux from a pulsed plasma serves to both heat and transiently cool the material surface. To identify potential mechanisms for this ‘plasma cooling,’ we employ time-resolved plasma diagnostics to correlate the photon and charged particle flux with the thermal response of the material. The results indicate photon-stimulated desorption of adsorbates from the surface is the most likely mechanism responsible for this plasma cooling.

Date: 2022
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DOI: 10.1038/s41467-022-30170-5

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