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Fundamentals of Mass Spectrometry ―Chemical Reaction by Core Electron Excitation― |
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1 Department of Physical Science, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, HIROSHIMA, JAPAN 2 RIKEN SPring-8, Sayo, Sayo-gun, HYOGO, JAPAN |
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| Core electron excitation possesses an attractive potential of inducing selective chemical bond breaking. Compared to valence excitation, core excitation takes place within a small area because of its spatial localization and atomic selectivity. Therefore, a specific atom in a molecule can be excited selectively. The core-excited state is quite unstable with an extremely high energy, so consecutive decay processes―Auger decay and ionic dissociation―can occur in the vicinity of the excited atom. From this concept, site-selective ionic fragmentation has been widely and successfully investigated in various core-excited molecular systems. This paper briefly describes the characteristics of core excitation and experimental methods, and then reviews representative recent studies about site-selective chemical bond breaking induced by core excitation. | ||
| Key words: Core electron excitation, Site-selective excitation, Site-selective chemical bond breaking, Self-assembled monolayer (SAM), Time-of-flight mass spectrometry (TOF-MS) | ||
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