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Figure 1
(a) Geometry for observing fluorescence from helium Rydberg states excited by linearly polarized XUV light. (b) Energy level diagram of helium, depicting the excitation and decay pathways relevant to the present measurement.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 27| Part 3| May 2020| Pages 675-680
https://doi.org/10.1107/S1600577520002829
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