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Table 1 Details on sample preparation and characteristics

From: Longitudinal spin relaxation in nitrogen-vacancy ensembles in diamond

Sample Synthesis [N] (ppm) [NV ] (ppm) Radiation dose (cm −2 ) Annealing (°C)
E1 HPHT <200 18 1018 650
E2 HPHT <200 20 1018 650
S5 HPHT <200 40 8 × 1017 700
W5 HPHT <200 2 1.5 × 1017 750
E8 CVD <1 0.02 1016 650