The Structures of the [2M–1]+ ions formed from benzene in a high pressure mass spectrometer source

The ionic species [C₁₂H₁₁]⁺ has been formed by ion-molecule reactions in benzene at high pressure (?0.5 Torr). This ion has been shown to be stable for at least 10^?5 s and its structure has been inferred by a study of its unimolecular and collision induced fragmentations in both the first and second field free regions of the ZAB-2F mass spectrometer.