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Figure 1
X-ray energy spectra of samples with (a) [Er] = 2 × 1012 atoms (the number of Er atoms in a 1.5 mm × 1.0 mm spot), (b) [Er] = 5 × 1012 atoms, and (c) [Er] = 1.4 × 1013 atoms. |
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Figure 1
X-ray energy spectra of samples with (a) [Er] = 2 × 1012 atoms (the number of Er atoms in a 1.5 mm × 1.0 mm spot), (b) [Er] = 5 × 1012 atoms, and (c) [Er] = 1.4 × 1013 atoms. |