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Nitrogen optical emission during nanosecond laser ablation of metals: prompt electrons or photo-ionization?
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0002-6712-3625
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0001-9632-8104
2014 (English)In: Applied Physics A: Materials Science & Processing, ISSN 0947-8396, E-ISSN 1432-0630, Vol. 117, no 1, 409-413 p.Article in journal (Refereed) Published
Abstract [en]

Experiments on the interaction of metal targets with a Nd:YAG laser beam ( = 1,064 nm, intensity -) are carried out in a finite Nitrogen pressure environment. The observed spectra are unambiguous evidence of the existence of an ionization and excitation source, arriving at the observation volume prior to the plume. Such a source can be either prompt electrons or VUV radiation. The analysis reveals that the prompt electron interpretation requires energies in excess of 1 keV, incompatible with any acceleration mechanisms relevant for such laser intensities. On the other hand, VUV radiation is sufficiently strong to explain the observed spectra.

Place, publisher, year, edition, pages
2014. Vol. 117, no 1, 409-413 p.
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Physical Sciences
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URN: urn:nbn:se:kth:diva-154743DOI: 10.1007/s00339-014-8534-9ISI: 000342281800065Scopus ID: 2-s2.0-84919877321OAI: oai:DiVA.org:kth-154743DiVA: diva2:761156
Note

QC 20141105

Available from: 2014-11-05 Created: 2014-10-27 Last updated: 2017-12-05Bibliographically approved

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Ratynskaia, SvetlanaTolias, Panagiotis

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