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Figure 4
Scaling laws for the particle-beam focus with respect to entrance pressure. (a) Particle-beam widths (FWHM) for a range of pressures (see legend) are plotted against the distance from the injector tip. Particles were polystyrene spheres of 100 nm in diameter. The experimental data can be approximated with a Gaussian-beam model (solid lines). Scaling laws [solid lines in (b), (c) and (d)] were identified for the model parameters as functions of the entrance pressure p. (b) The particle-beam waist scales as p−(3/2). (c) The distance between particle focus and injector tip scales as p−(1/2). (d) The particle-beam divergence scales as p−1.

IUCrJ
Volume 5| Part 6| November 2018| Pages 673-680
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518010837