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Target charging during laser ablation of polyethylene
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SYSNO ASEP 0490025 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Target charging during laser ablation of polyethylene Author(s) Delle Side, D. (IT)
Caricato, A. P. (IT)
Krása, Josef (FZU-D) RID, ORCID
Nassisi, V. (IT)Number of authors 4 Article number 138 Source Title Applied Physics A - Materials Science & Processing. - : Springer - ISSN 0947-8396
Roč. 124, č. 2 (2018), s. 1-5Number of pages 5 s. Language eng - English Country DE - Germany Keywords laser ablation of polyethylene ; target charging Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Institutional support FZU-D - RVO:68378271 UT WOS 000424515500056 EID SCOPUS 85040843288 DOI 10.1007/s00339-018-1557-x Annotation The laser-matter interaction generates a time-varying current between the target and the grounded vacuum chamber. This current is composed by three distinct phases, namely, the ignition phase, active phase, and afterglow phase. We investigate the dependence of these current structures on the dimensions of the target, using ultra-high molecular weight polyethylene disks of different thickness. We provide evidence to explain the origin of such negative peaks. We found, indeed, that target initially charges positively under the action of the laser pulse, leading to a first negative target current peak. Then, a net charge unbalance is produced that further attracts free electrons on target surface. This behavior is enhanced if an opportune static electric field is imposed between the target and an opposite electrode. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2019
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