Nitrogen optical emission during nanosecond laser ablation of metals: prompt electrons or photo-ionization?
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
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.
IdentifiersURN: urn:nbn:se:kth:diva-154743DOI: 10.1007/s00339-014-8534-9ISI: 000342281800065ScopusID: 2-s2.0-84919877321OAI: oai:DiVA.org:kth-154743DiVA: diva2:761156
QC 201411052014-11-052014-10-272014-11-05Bibliographically approved