Year: 2022
Type: article
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.
Source: Nature Communications
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,890
Awards: G1523888516, G1751986480, G3358329757, INFRARED VIBRATIONAL THERMAL SPECTROSCOPY TO STUDY SPECTRAL ENERGY COUPLING ACROSS SOLIDS IN CONTACT WITH LIQUIDS AND GASES, G6098521345, G617492437, G8006577219, TAS::57 3600::TAS 'NONEQUILIBRIUM ELECTRON AND PHONON THERMAL TRANSPORT DRIVEN BY EXTERNAL FIELDS: TOWARDS IN SITU THERMAL ...', G8876996369
OpenAlex ID: W3190185011