Specific fragmentation of the K-shell excited/ionized aniline molecule studied by electron impact

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• 作者：Kazumasa Okada ; Yasuhiko Kashiwagi ; Masamichi Sakai
• 关键词：Site-specific fragmentation ; Inner-shell excitation ; Electron impact
• 刊名：International Journal of Mass Spectrometry
• 出版年：2013
• 出版时间：1 October, 2013
• 年：2013
• 卷：351
• 期：Complete
• 页码：56-60
• 全文大小：1022 K

文摘

Fragmentation of aniline upon K-shell excitation/ionization has been studied by the electron impact method. Ions detected as dominant fragments were C₃H₃⁺, CHNH⁺/CNH₂⁺, C₃H₂⁺, etc. The C₃H₃⁺ ion was produced characteristically at the N 1s edge. We found from the mass spectra of aniline-2,3,4,5,6-d₅ that CD₃⁺ is formed independent of excitation energy, suggesting that the aniline molecular cation isomerizes prior to dissociation. The mass spectra of the fragment ions by the direct dissociation of aniline were deduced by subtracting the contribution from the dissociation of the isomer, 4-methylpyridine. Enhancement of the C₃H₃⁺, CHNH⁺/CNH₂⁺, and NH⁺ yields at the N 1s edge shows that the cleavage of the C1C2 bond of the initial benzene ring and the CN bond fission are likely to take place by the N 1s excitation and ionization.