Abstract :
[en] The proton formation by dissociative electroionization of methane has been investigated in the energy range of 25-40 eV. The kinetic energy-versus-appearance energy shows five different H+ producing processes respectively at (26.3+/0.2) eV, (26.9+/-0.2) eV, (29.4+/-0.3) eV, (32.7+/-0.2) eV and (35.7+/-0.5) eV. These critical energies are discussed in terms of different dissociation channels opened through predissociation of doubly excited states of CH4+. On the high energy side of the electron energy range in the present work, the proton would appear through the dissociation of the CH+ ion as an intermediate.
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