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CH4 ionization and dissociation by proton and electron impact

H Luna1, E G Cavalcanti1, J Nickles1,2, G M Sigaud1 and E C Montenegro1,3

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Absolute dissociative and non-dissociative ionization cross sections of CHn+ (n = 0–4) molecules by protons in the 0.5–3.5 MeV impact energy range have been measured. The present results are in good agreement with the previously published data, where overlap occurs. A decay-route model for CH4 dissociation induced by proton impact is proposed and a method to obtain the corresponding branching ratios is introduced. The consistency and extent of the proposed model and methodology is verified through its application in the case of electron-impact dissociation.


PACS

34.80.Gs Molecular excitation and ionization

34.80.Ht Dissociation and dissociative attachment

Subjects

Atomic and molecular physics

Dates

Issue 23 (14 December 2003)

Received 6 August 2003

Published 11 November 2003



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