Fig. 12From: Analysis of velocity-mapped ion images from high-resolution crossed-beam scattering experiments: a tutorial reviewIllustration of misinterpretation of center and radius of Newton circle. The figure shows the error when these parameters are derived from a scattering image. a Hypothetical block DCS that is unity from θ= 0 ° to θ max = 100 ° and zero otherwise. b Scattering image that results from this block DCS, together with the true Newton diagram for this scattering process (green) and the Newton ring that is found by fitting the scattering intensity of the image using the Hough transformation (red curve). (c and d) Center point coordinates (x c and y c in panel (c) and (d), respectively) of the Newton diagram resulting from the Hough transform for hypothetical block DCSs as a function of the value for θ max. The center points of the true Newton diagram are indicated by horizontal dashed linesBack to article page