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https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/25734
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| 題名: | Effects of reactant ion kinetic energy on both endothermic and exothermic ion/molecule reactions in a quadrupole ion trap mass spectrometer |
| 作者: | 吳慧芬;Wu, Hui-Fen;Brodbelt, Jennifer S. |
| 貢獻者: | 淡江大學化學學系 |
| 關鍵詞: | Endothermic ion/molecule reactions;Quadrupole ion trap;Kinetic energy |
| 日期: | 1993-05 |
| 上傳時間: | 2009-12-01 09:13:40 (UTC+8) |
| 摘要: | The effects of kinetic energy on the outcomes of exothermic and endothermic ion/molecule reactions in a quadrupole ion trap mass spectrometer are examined. Endothermic proton-transfer and charge exchange reactions may be driven in a quadrupole ion trap by acceleration of selected reactant ions to higher kinetic energies, via resonant power absorption from a supplementary a.c. voltage, prior to collisions with neutral substrate molecules. Reactions as endothermic as 1.1 eV for either proton-transfer or charge exchange processes have been promoted, with maximum conversion efficiencies of reactant ions to product ions ranging from 5 to 15% under optimized conditions. Depending on the nature of the reactant ion and its possible reaction pathways, activation of a selected ion may lead to a combination of collisionally-activated dissociation, ion loss from the trap by impingement upon an electrode or ejection, and endothermic ion/molecule reaction. Activation of reactant ions prior to exothermic ion/molecule reactions in the quadrupole ion trap results in decreased reaction efficiency, a result expected for translationally hot ions. |
| 關聯: | Proceedings of the 41th ASMS Conference on Mass Spectrometry and Allied Topics, pp.192a-192b |
| 顯示於類別: | [化學學系暨研究所] 會議論文
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