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    請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/25734

    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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