Superthermal Al Atoms as a Reactive-Atom Probe of Fluorinated Surfaces.

ABSTRACT: We demonstrate a proof-of-concept of a new analytical technique to measure relative F atom exposure at the surfaces of fluorinated materials. The method is based on reactive-atom scattering (RAS) of Al atoms, produced by pulsed laser ablation of solid Al at 532 nm. The properties of the incident ground-state Al were characterized by laser-induced fluorescence (LIF); at typical ablation fluences, the speed distribution is approximately Maxwellian at ∼45000 K, with a most-probable kinetic energy of 187 kJ mol^-1 and a mean of 560 kJ mol^-1 When these Al atoms impact the surfaces of perfluorinated solids (poly(tetrafluorethylene), PTFE) or liquids (perfluoropolyether, PFPE), gas-phase AlF products are clearly detectable by LIF on the AlF A-X band. Quantitative AlF yields w

SUBMITTER: Lane PD 

PROVIDER: S-EPMC10331727 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature