Charge and excitation state of Na projectiles scattered from Al surfaces

Runco, D.; Riccardi, P.

doi:10.1080/10420150.2021.1986824

Cited by 7 publications

(1 citation statement)

References 31 publications

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“…In the case of Neon projectiles, the spectra show also features due to kinetic emission: the low energy peak due to electrons excited in the cascade of electronic collisions inside the solid, and two lines at energies around 20-25 eV due to the autoionization of Ne 2p 4 3s 2 excited by electron promotion in violent binary atomic collisions with surface atoms [42][43][44][45]. These last peaks have been recently investigated for the information they provide in the electronic processes that occur in ion-solid interactions [46][47][48][49] and are not correlated to plasmon excitation [32]. In the case of Neon, PEE produces two broad features in the spectra of emitted electrons, due respectively to the Auger Neutralization and the Plasmon assisted neutralization processes.…”

Section: Resultsmentioning

confidence: 99%

Plasmon Excitation in the Interaction of Slow Singly Charged Argon Ions with Magnesium

Riccardi

2024

Solids

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We report angle-resolved energy spectra of electron emitted in the interaction of slow singly charged heavy ions with Mg surface. The work is focused mainly on the excitation of plasmons of Mg under Argon impact. Potential excitation of plasmons occurs when incoming ions are neutralized at the expense of the potential energy carried by incoming ions. The process competes with the known mechanisms of neutralization via Auger transitions. Differently from Al samples, our results show that the neutralization of Ar+ ions at Mg is dominated by the excitation of surface plasmons by the potential energy released in the electron capture process that neutralizes incoming ions. Bulk plasmon excitation is observed at higher impact energy and is ascribed to fast electrons excited by the transfer of the kinetic energy of incoming particles. The data show that bulk plasmon excitation occur inside the bulk, while the theoretically predicted excitation by potential energy transfer of incoming projectiles is not observed.

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