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Full set of Notes with Fill-Ins - San Jose State University

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Chem 155 Unit 16 282 <strong>of</strong> 316Ionization Sources1.1.62 Electron Impact (EI):‘Hard’ ionization:extensive fragmentation1.1.63 Chemical Ionization:Derivative <strong>of</strong> EI but <strong>with</strong> 1000:1 excess <strong>of</strong>:reagent gas e.g.CH 4‘S<strong>of</strong>t’ ionization:limited fragmentationCH 4 collision <strong>with</strong> electron CH 4+ , CH 5+ , CH3 +CH 4+ , CH 5+ , CH3 + recombination, rxn w/ CH 4 C 2 H 5+CH 5+ + MH MH 2+ Proton transfer M+1+ CH 4C 2 H 5+ + M M C 2 H 5+ethyl transfer M+15Page 282 <strong>of</strong> 316

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