Université de Lyon, F-69622, Lyon, France.
J Chem Phys. 2011 Jan 21;134(3):034304. doi: 10.1063/1.3523347.
We have studied the excitation and dissociation processes of the molecule W(CO)(6) in collisions with low kinetic energy (3 keV) protons, monocharged fluorine, and chlorine ions using double charge transfer spectroscopy. By analyzing the kinetic energy loss of the projectile anions, we measured the excitation energy distribution of the produced transient dications W(CO)(6)(2+). By coincidence measurements between the anions and the stable or fragments of W(CO)(6)(2+), we determined the energy distribution for each dissociation channel. Based on the experimental data, the emission of the first CO was tentatively attributed to a nonstatistical direct dissociation process and the emission of the second or more CO ligands was attributed to the statistical dissociation processes. The dissociation energies for the successive breaking of the W-CO bond were estimated using a cascade model. The ratio between charge separation and evaporation (by the loss of CO(+) and CO, respectively) channels was estimated to be 6% in the case of Cl(+) impact.
我们使用双电荷转移光谱研究了分子 W(CO)(6)在与低动能（3 keV）质子、单电荷氟和氯离子碰撞中的激发和离解过程。通过分析射弹阴离子的动能损失，我们测量了产生的瞬态双阳离子 W(CO)(6)(2+)的激发能分布。通过阴离子和稳定或 W(CO)(6)(2+)碎片之间的符合测量，我们确定了每个离解通道的能量分布。基于实验数据，初步将第一个 CO 的发射归因于非统计直接离解过程，而第二个或更多 CO 配体的发射归因于统计离解过程。使用级联模型估计了连续打破 W-CO 键的离解能。在 Cl(+)冲击的情况下，电荷分离和蒸发（分别通过 CO(+)和 CO 的损失）通道的比值估计为 6%。
