| Discrimination of Structural Isomers of Aromatic Compounds with EI Mass Spectra and Their Ionization Efficiency Curves of Dehydrogenated Fragment Ions |
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| 摘 要： | Wehavereportedtheeffectofovercrowdinginthemassspectfaofcondensedpolycyclicaromaticcompounds'-'.Themassdifferencebetweenamolecularionandthemostintensefragmentionintheionfamilyofthehighestvalencecorrespondstothenumberofovercrowdedhydrogenatomsdetachingfromtheparention,andtheirmasspatternsaredifferentwiththetypeofovercrowding,i.e.fjord-orcrab-likeovercrowding.Thehighabundanceofspecificfragmentionsat70Vwascorrelatedwiththeloweringoftheirappearanceenergies.Hereweinvestigatedthemassspectraandthemech…
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Discrimination of Structural Isomers of Aromatic Compounds with EI Mass Spectra and Their Ionization Efficiency Curves of Dehydrogenated Fragment Ions |
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| Abstract: | The mechanism of ionization and fragmentation for terphenyl (diphenylbenzene) withthree structural ring isomers (ortho-, meta- and para-), and stilbene (1,2-diphenylethylene) with two geometrical isomers (trans- and ets-) by EI mass spectrometry and ionizstion efficiency curves are investigation. |
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| Keywords: | terphenyl and stilbene EI mass spectrometry Ionization efficiency curve overcrowding effect Fragmentation mechanism |
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