Analysis of laser produced plasmas of gold in the 1-7 nm region

Bowen Li, Takeshi Higashiguchi, Takamitsu Otsuka, Noboru Yugami, Padraig Dunne, Deirdre Kilbane, Emma Sokell, Gerry O'Sullivan

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21 Citations (Scopus)

Abstract

Extreme ultraviolet (EUV) spectra from gold laser produced plasmas were recorded in the 1-7 nm region using two Nd:YAG lasers with pulse lengths of 150 ps and 10 ns, respectively, operating at a range of power densities. The maximum focused peak power density was 9.5 × 1013 W cm-2 for the former and 5.3 × 1012 W cm-2 for the latter. Two intense quasicontinuous intensity bands resulting from n = 4-n = 4 and n = 4-n = 5 unresolved transition arrays dominate the 4-5.5 and 1.5-3.6 nm regions of both spectra. Comparison with atomic structure calculations performed with the Cowan suite of atomic structure codes as well as consideration of previous experimental and theoretical results aided identification of the most prominent features in the spectra. For the ns spectrum, the highest ion stage that could be identified from the n = 4-n = 5 arrays was Au28+ while for the ps plasma the presence of significantly higher stages was deduced and lines due to 4d104f-4d94f2 transitions in Ag-like Au 32+ give rise to the strongest observed features within the n = 4-n = 4 array while in the n = 4-n = 5 array it was possible to identify a number of previously unidentified spectral features as resulting from 4f-5g transitions in the spectra of Au XX to Au XXXIII.

Original languageEnglish
Article number075001
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume47
Issue number7
DOIs
Publication statusPublished - 14 Apr 2014
Externally publishedYes

Keywords

  • extreme ultraviolet
  • gold
  • laser-produced plasma

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