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EUV spectra of europium—Chasing for spectral lines of P‐ to Ar‐like ions
Author(s) -
Träbert Elmar,
Beiersdorfer Peter,
Brown Gregory V.,
Hell Natalie,
Clementson Joel H.T.
Publication year - 2019
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.3099
Subject(s) - europium , ion , spectral line , atomic physics , excited state , emission spectrum , extreme ultraviolet lithography , electron beam ion trap , electron ionization , physics , electron , ionization , optics , cathode ray , quantum mechanics , astronomy
The understanding of atomic structure implies a combination of accurate measurements and a reliable theoretical framework. Atomic structure computations are employed to bridge the many gaps in the experimental data, but their results need to be tested by measurements. We have selected extreme ultraviolet spectra of europium (Eu, Z = 63) for such tests. We study the emission spectra of Eu ions produced and excited in an electron beam ion trap by observation with highly resolving spectrographs. General purpose atomic structure computations help us at disentangling the spectra and identifying the emission of specific charge state ions. At the same time, the wavelength data provide a tool to judge the quality of the computations. The present study concentrates on ions of the charge states q = 45+ to q = 49+ or P‐ to Ar‐like ions of Eu.