Fig. 6 | Scientific Reports

Fig. 6

From: Laser isotope enrichment of 168Er

Fig. 6

Two dimensional ionization efficiency contour of natural erbium under Doppler free condition. The third excitation laser is tuned to 168Er resonance. The bandwidth and intensity of all excitation lasers are 100 MHz and 5 W/cm2 respectively. The weakly observed 15/2–17/2–19/2 hyperfine pathway of 167Er isotope is marked with *. Additional resonance of 162Er isotope is marked with #.

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