Figure 9

Mapping of axial position x _c to resistance pulse magnitude ΔI/I _p in channels containing a central cavity. (a) Scatter plot of axial position Δx _c and relative current amplitude ΔI/I _p . The solid red line indicates the average of all of the data points at a given position; red dashed lines are the average plus/minus one standard deviation. The black dashed lines indicate the entrance and exit of the channel. The current does not attain its maximal value when the particle occupies the exact entrance/exit of the channel. The local maximum in the center is at positions when the particle occupies the channel’s cavity. (b) Superimposed images of the particles occupying various positions in the channel. c: Raw (gray line) and smoothed (red line) RP data of the event passage. The marked positions in b and c mark synchronized data points. a, a’: Closest frames to particle occupying the entrance/exit of the channel. b, b’: Particle position when the current amplitude attains its maximal value. (c) Particle position when the current amplitude attains its minimal value.