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首页> 外文期刊>The Journal of Chemical Physics >Surface induced dissociations of protonated ethanol monomer,dimer and trimer ions;trimer break-down graph from the collision energy dependence of projectile fragmentation
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Surface induced dissociations of protonated ethanol monomer,dimer and trimer ions;trimer break-down graph from the collision energy dependence of projectile fragmentation

机译：质子化乙醇单体，二聚体和三聚体离子的表面诱导解离;由弹丸碎片的碰撞能量依赖性确定三聚体分解图

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摘要

Surface induced dissociation of the protonated ethanol molecular ion,protonated ethanol dimer,and protonated ethanol trimer on a stainless steel surface covered by hydrocarbons was investigated over the incident ion energy range 10-80 eV. Mass spectra of the product ions were recorded and from them the dependencies of the relative abundance of the product ions on the collision energy (CERMS,collision energy resolved mass spectra) were obtained. The dissociation kinetics follows the unimolecular decomposition model of a surface-excited polyatomic projectile behaving as a statistical ensemble. The CERMS curves of the three projectiles,normalized tothe same number of internal degrees of freedom,fit each other over the respective energy regions,and matched together provide information on the break-downpattern of the surface-excited protonated ethanol trimer over a wide energy range. This clearly shows that surface collisions can be used to impart in a defined manner a certain excitation energy to the projectile ion. The binding energy of anethanol monomer in the protonated trimer and in the protonated dimer was estimated form the data as 0.95 and 1.6 eV,respectively,in good agreement with earlier data.
机译：研究了质子化乙醇分子离子，质子化乙醇二聚物和质子化乙醇三聚物在碳氢化合物覆盖的不锈钢表面上的表面离解，其入射离子能量范围为10-80 eV。记录产物离子的质谱，并从中获得产物离子的相对丰度对碰撞能量（CERMS，碰撞能分辨质谱）的依赖性。离解动力学遵循表面激发的多原子弹丸的单分子分解模型，该模型表现为统计集合。归一化为相同数量的内部自由度的三个弹丸的CERMS曲线在各自的能量区域上相互拟合，并匹配在一起，从而提供了在较宽的能量范围内表面激发的质子化乙醇三聚体的分解模式信息。这清楚地表明，表面碰撞可用于以限定的方式向弹丸离子赋予一定的激发能。根据数据估计，乙醇单体在质子化三聚体和质子化二聚体中的结合能分别为0.95和1.6 eV，与先前的数据非常吻合。

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