Dissociation of methanol dications produced by electron capture with and without transfer ionization
Dissociation of methanol dications produced by electron capture with and without transfer ionization
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DOI：
10.1088/0953-4075/44/7/075207
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发表时间：
2011-04-14
影响因子：
1.6
通讯作者：
Achiba, Y.
中科院分区：
文献类型：
--
作者：
Hayakawa, K.;Mastumoto, J.;Achiba, Y.
研究了不同甲醇同位素的Ar（8+）低能碰撞引起的双电离和随后的离子对解离，以了解瞬态甲醇双离子反应与散射离子电荷态的关系。反冲离子的单次撞击飞行时间（TOF）光谱（不包括多次撞击事件）表明，长寿命的分子指示总是与Ar（7+）散射离子相关，这表明它们仅由伴随转移电离的双捕获碰撞形成。碎片离子的双击飞行时间测量表明，CH/OH断裂的分支比在很大程度上取决于散射离子的电荷状态。H/D取代对氢迁移的影响表明，原子的协调运动是该反应途径所必需的。
Double ionization and subsequent ion-pair dissociation induced by low-energy collisions of Ar(8+) were studied for various methanol isotopomers to understand how the reactions of transient methanol dications correlate with the charge states of the scattered ions. Single-hit time-of-flight (TOF) spectra of recoil ions excluding multi-hit events show that long-lived molecular dications always correlate with Ar(7+) scattered ions, indicating that they are formed only by double-capture collisions that accompany transfer ionization. The double-hit TOF measurements of fragment ions show that the branching ratios of CH/OH cleaving largely depend on the charge states of scattered ions. The H/D substitution effect on the hydrogen migration indicates that a concerted motion of atoms is essential for this reaction pathway.