Fragmentation of CH4 caused by fast-proton impact.

The cross sections of the different breakup channels of CH 4 , produced by 4-MeV proton impact, have been measured using the coincidence time-of-flight technique. The relative abundances of the different breakup channels were evaluated for collisions in which the molecule broke into two charged fragments as well as for collisions where only a single charged molecular ion or fragment was produced. These relative abundances are compared to the ones measured for photodissociation and for electron and proton impact. Only the CH 4 + ion survives long enough to be detected as a molecular ion, while the doubly charged CH 4 2+ ion dissociates rapidly

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