Fig. 2: Ion images, covariance images, and momentum comparisons.
a Velocity-map images and b covariance map images for the C3H\({}_{x}^{+}\) and C10H\({}_{y}^{+}\) fragment ions arising from dissociative ionization of FLU, C13H10. Each image is individually normalized. The velocity-map images are presented without symmetrization or Abel-inversion to provide a better comparison to the covariance images. The small areas lacking signal near the center of the velocity-map images are attributed to damage in the MCP/phosphor detector. Black arrows in the covariance images indicate the direction of the reference ion. c Momentum profiles of the ion pairs resulting from the two-body dissociative ionization of fluorene. An angular integration is performed on the covariance images, and the spatial coordinates are converted to momentum units. Cov(A, B) refers to the covariance of ion A with B as the reference ion. Discrepancies between the plots in (i) are attributed to physical defects in the detector and background ions affecting the ion images differently.
