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. 2015 Sep 2;2(5):051101. doi: 10.1063/1.4930174

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© 2015 Author(s).

2329-7778/2015/2(5)/051101/7

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FIG. 2. — Dependence of (a) photoelectron collection efficiency (CE), (b) energy spread (ΔE₅₀), and (c) temporal spread (Δt₅₀) on LaB₆ position relative to the Wehnelt aperture (Z_tip) for the single-electron (green squares) and burst (red circles) modes. (d) Dependence of the statistical temporal spread for the single-electron mode on Z_tip for full, incident laser-pulse durations of 280 fs (blue triangles), 80 fs (purple inverted triangles), and 10 fs (light-blue diamonds). The key in (a) corresponds to (a)–(c), while the key in (d) is specific to that panel. The gray, dashed vertical line at Z_tip = 350 μm denotes a position at which the single-electron CE is 100%.