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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Experimental evidence for the curve crossing mechanism for collisional excitation in keV N-2(+center dot)/He collisions by emission spectroscopy
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Experimental evidence for the curve crossing mechanism for collisional excitation in keV N-2(+center dot)/He collisions by emission spectroscopy

机译：发射光谱法研究keV N-2（+中心点）/ He碰撞中碰撞激发的曲线交叉机理的实验证据

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Collision-induced emission (CIE) experiments were carried out by coupling a spectrograph and charge-coupled device detector (CCD) to a commercial analytical mass spectrometer. An Einzel lens and a deceleration-reacceleration lens assembly as described in the current article were installed in the mass spectrometer to allow for the deceleration of the ions before collision. Collision-induced emission spectra of N-2(+center dot)/He collisions at lab frame collision energies from 2 to 8 keV were obtained from 190-1020 nm. The emissions were assigned to the Delta v = +2, +1, 0, -1, -2 vibrational transition progression in the N-2(+center dot) B (2)Sigma(+)(u) -> X (2)Sigma(+)(g) electronic transition as well as some atomic lines from the fragments N+, N-center dot and the target gas He. N-2(+center dot) A (2)Pi(u) -> X (2)Sigma(+)(g) emission was also observed but was very weak due to the long lifetime of the A (2)Pi(u) state. The relative intensities of the N-2(+center dot), N, and N+ emissions are independent of the ion translational energy within the studied energy range. This observation supports the curve-crossing mechanism for collisional excitation, suggesting that a complicated sequence of curve-crossings takes place upon collisional activation.
机译：碰撞诱导发射（CIE）实验是通过将光谱仪和电荷耦合器件检测器（CCD）耦合到商用分析质谱仪来进行的。如当前文章中所述，Einzel透镜和减速-减速透镜组件已安装在质谱仪中，以允许离子在碰撞前减速。在190-1020 nm范围内获得了在2至8 keV的实验室框架碰撞能量下N-2（+中心点）/ He碰撞的碰撞诱导发射光谱。排放物在N-2（+中心点）B（2）Sigma（+）（u）-> X（+）中被分配给Delta v = + 2，+ 1、0，-1，-2振动转变过程。 2）Sigma（+）（g）电子跃迁以及来自碎片N +，N中心点和目标气体He的一些原子线。 N-2（+中心点）A（2）Pi（u）-> X（2）Sigma（+）（g）的发射也被观察到，但由于A（2）Pi（ u）状态。 N-2（+中心点），N和N +发射的相对强度与所研究的能量范围内的离子平移能量无关。该观察结果支持了碰撞激励的曲线交叉机制，表明在碰撞激活时发生了一系列复杂的曲线交叉。

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