3D-momentum-imaging spectroscopy of fragment ions produced in electron transfer collisions between energy-gain selected Arq+ (q = 3, 8, 9,11 and 12) and CF4 molecules
3D-momentum-imaging spectroscopy of fragment ions produced in electron transfer collisions between energy-gain selected Arq+ (q = 3, 8, 9,11 and 12) and CF4 molecules
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能量增益选定的 Arq（q = 3、8、9,11 和 12）与 CF4 分子之间电子转移碰撞产生的碎片离子的 3D 动量成像光谱
DOI：
10.1088/0953-4075/36/9/312
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
S. Tsurubuchi
中科院分区：
文献类型：
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作者：
K. Motohashi;S. Tsurubuchi
在Arq+（q = 3，8，9，11，12）与CF 4的电子转移碰撞中，同时测量了Ar（q−1）+* 小角度（< 0.29 mrad）散射的能量增益和碎片离子的三维动量。实验是在电子转移过程后产生的中间碰撞系统的能量增益近似等于反应热的条件下进行的。在能量增益谱中清楚地观察到了单电子转移的主要成分以及双、三、四电子转移过程的转移电离的子成分。能量增益谱的位置和高度与经典过势垒模型的理论计算值吻合较好。碎片离子的飞行时间质谱的形状在单电子转移和双电子转移（转移电离）之间发生了巨大的变化。用新的光谱装置测量了F+、CF+、CF 2+、CF 3+、CF 22+和CF 32+的三维动量，以及Ar（q−1）+* 的能量增益。考虑到从碎片离子的3D动量转换的释放动能和反应热，通过实验指定了电子转移后立即产生的Ar（q-n）+* 和CF 4 n +*（n = 1和2）的两种电子状态。
The energy gain of Ar(q−1)+* scattered at small angle (< 0.29 mrad) and three-dimensional momenta of fragment ions were measured in coincidence in electron transfer collisions between Arq+ (q = 3, 8, 9, 11 and 12) and CF4. The experiments were carried out under the condition that the energy gain becomes approximately equal to the heat of reaction for the intermediate collision system produced just after the electron transfer process. Main components due to single-electron transfer as well as sub-components due to transfer ionization of double-, triple- and quadruple-electron transfer processes were clearly observed in the energy-gain spectra. The position and height of the energy-gain spectra were in good agreement with the theoretical ones calculated by the classical over-the-barrier model. The shapes of time-of-flight mass spectra of fragment ions were drastically changed between single-and double-electron transfer (transfer ionization). 3D momenta of F+, CF+, CF2+, CF3+, CF22+ and CF32+ were measured with a new spectroscopic device, as well as the energy gain of Ar(q−1)+*. Both electronic states of Ar(q−n)+* and CF4n+* (n = 1 and 2) produced just after the electron transfer were assigned experimentally by taking into account the released kinetic energy which was converted from the 3D momenta of fragment ions and the heat of reaction.