Formation of M+ ions and electronic excitation under fast-atom bombardment conditions by using a liquid matrix |
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Authors: | Mitsuo Takayama |
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Institution: | 1. Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, 274, Funabashi, Chiba, Japan
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Abstract: | Japan The mechanism for the formation of molecular ions M+· under fast-atom bombardment (FAB) conditions with a liquid matrix is discussed on the basis of the mass spectra of pyrene, coronene, and fullerene C60 obtained by using electron impact, gas-phase fast-atom bombardment, and gas-phase fast-molecule bombardment techniques. The obtained results suggest that formation of the M+· ions under FAB conditions is not due to direct collisions between analytes M and fast atoms A, but is due to collision interactions between M and recoiling matrix molecules B or matrix ions. It has been confirmed, furthermore, that the FAB conditions with a liquid matrix are sufficient in energy for formation of singly charged ions M+· and insufficient for the formation of multiply charged ions M z+ (z=2, 3) of pyrene, coronene, and C60. |
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