Figure 3

PIPICO map from dissociative ionization of CH₃OH. On the PIPICO map, the five vertical (dashed) lines represent the approximate center lines of the regions where H⁺, H₂ ⁺, H₃ ⁺, CH₃ ⁺, and H₂O⁺ ions are recorded. The three horizontal (dashed) lines indicate CH₃OH⁺, CH₂OH⁺/CH₃O⁺, and COH⁺ /HCO⁺ ion regions. The contour region with an approximate slope of −1 at the intersection of the vertical H₃ ⁺ line and the horizontal COH⁺/HCO⁺ line represents the coincidence channel of H₃ ⁺and COH⁺/HCO⁺. The logarithmic color scale depicts the event rate in units of events/shot.