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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Ion Imaging of Mgl(+) Photofragment in Ultraviolet Photodissociation of Mass-Selected Mg+ICH3 Complex
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Ion Imaging of Mgl(+) Photofragment in Ultraviolet Photodissociation of Mass-Selected Mg+ICH3 Complex

机译：Mg + ICH3复合物的紫外光解体中MgL（+）光折叠的离子成像

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摘要

We have observed images of Mgr fragment ions produced in ultraviolet laser photodissociation of mass-selected Me+ICH3, ions at 266 nm. Split distribution almost perpendicular to the polarization direction of the photolysis laser was observed in the photofragment image. Potential energy curves of Mg+ICH3, were obtained by theoretical calculations. Among these curves, the excited complex ion dissociated along almost repulsive potentials with several avoided crossings, which was connected to MgI+ + CH3. In the ground state of Me+ICH3, the CH3I was bonded with Mg from the iodine side, and the Mg-I-C bond angle was calculated to be 101.1 degrees. The theoretical results also indicated that the dissociation occurred after the 5(2)A' - 1(2)A' photoexcitation, where the transition dipole moment was almost parallel to the Mg I bond axis. The Mgr and CH3 fragments dissociated each other parallel to the direction connecting those center-of-masses, which was 67 with respect to the transition dipole moment of 5(2)A' + 1(2)A' photoexcitation. Therefore, the fragment recoil direction was assumed to approach perpendicular tendency against the polarization direction under the fast dissociation process. However, calculated potential energy curves showed a complicated reaction pathway for MgI+ production, including nonadiabatic processes, although the experimental results indicated the fast dissociation reaction.
机译：我们观察到在266nm的紫外线激光光化的MGR片段离子中产生的MGR片段离子的图像。在光反射图像中观察到几乎垂直于光解激光的偏振方向的分布。通过理论计算获得Mg + Ich3的潜在能量曲线。在这些曲线中，沿着几乎排斥的电位分离的激发复合物离子与几个避免的横向交叉，其连接到Mgi + + CH3。在ME + ICH 3的研磨处，CH 3 I与碘侧的Mg键合，Mg-I-C键角计算为101.1度。理论结果还表明，在5（2）A''之后发生解离，其中过渡偶极矩几乎平行于Mg I键轴。 MGR和CH3片段彼此平行地与连接那些质量中心的方向相对于67相对于5（2）''+ 1（2）A'光透视。因此，假设片段反冲方向在快速解离过程下接近垂直倾向倾向于偏振方向。然而，计算出的潜在能量曲线显示了MgI +生产的复杂反应途径，包括非抗脂过程，尽管实验结果表明了快速解反应。

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