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Figure 3
The 3- state of the helium 1s2 → (2spn ± 2pns) double-excitation spectrum as a function of exit slit opening for the 400 l mm−1 (red) and 600 l mm−1 (blue) gratings. Spectra are offset vertically for clarity.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
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