Figure 10
From: Characteristics of Ions Emission from Ultrashort Laser Produced Plasma

Shows the ion energy distribution flux for both fast and slow ions.
Fast ions (b) seem to have broader distribution than slow ions (a). Data presented here are results of 1.84 J/cm2 or 4.6 × 1013 W/cm2 laser target interaction with 45° incident angle, and the ions are collected by IC, 9 cm away from the target.