Fragmentation of anthracene induced by collisions with 40 keV Ar 8+ ions
Résumé
We report on the fragmentation of anthracene molecular ions C14H10r+ as a function of the parent ion initial charge r (= 1–4). Neutral anthracene molecules in the gas phase were ionized and excited in collisions with Ar8+ ions at 40 keV and the mass-to-charge spectra of the parent ions C14H10r+ (1 ≤ r ≤ 4) were obtained. Stable molecular ions C14H10r+ (1 ≤ r ≤ 3) are observed. Branching ratios for the competitive evaporation (loss of neutral fragments) and fragmentation (charge separation) processes were measured for C14H102+ parent ions. For C14H103+ parent ions, the results indicate that fragmentation is the only dominant process and quasi-symmetric fission is observed.