Figure 3.
(a) The number of nanocrystals as a function of time for four different beam currents, imaged at M = 100,000x and 5 μs pixel dwell time (red triangle: ie = 40 pA, blue square: ie = 20 pA, green diamond: ie = 14 pA, yellow inverted triangle: ie = 7 pA). (b) Histograms of the number of new particles as a function of time for each beam current. (c) Box plots of the induction threshold doses as a function of electron dose per scan (c.f. Methods for calculation of electron dose per scan from beam current). On each box, the central mark is the median, the edges of the box are the 25th (bottom edge) and 75th percentiles (top edge), and the whiskers extend to the most extreme data points not considered outliers. Values with a similar letter do not differ significantly (Wilcoxon rank sum test, P < 0.01).