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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Theoretical Study of Sc~(2+), Ti~(2+), V~(2+), Cr~(2+), and Mn~(2+) Bound to H_2
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Theoretical Study of Sc~(2+), Ti~(2+), V~(2+), Cr~(2+), and Mn~(2+) Bound to H_2

机译:与H_2结合的Sc〜(2 +),Ti〜(2 +),V〜(2 +),Cr〜(2+)和Mn〜(2+)的理论研究

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摘要

The binding energies, vibration frequencies, and geometry of the high spin complexes of the dispositive transition metals, Sc~(2+), Ti~(2+), V~(2+), Cr~(2+), and Mn~(2+), with molecular H_2 have been determined for all states correlating to the lowest term of the dispositive ion using multireference CI techniques. As expected, the bonding in these complexes is dominated by electrostatic (that is, enhanced by electron correlation) and varies smoothly across the sequence from Sc to Mn. The high spin complexes for Sc~(2+), Ti~(2+), V~(2+), Cr~(2+), and Mn~(2+) are the thermodynamic ground state for the MH_2~(2+) system. For Cr~(2+), however, the large second ionization energy of Cr results in the charge exchange reaction Cr~(2+) + H_2 → Cr~+ + H_2~+ being competitive with the electrostatic complex. The computed properties are compared with those for the corresponding monopositive ions.
机译:沉积过渡金属Sc〜(2 +),Ti〜(2 +),V〜(2 +),Cr〜(2+)和Mn的高自旋配合物的结合能,振动频率和几何形状使用多参考CI技术已确定了与分子态H_2相关的〜(2+)分子与与沉积离子最低项相关的所有状态。正如预期的那样,这些络合物中的键主要受静电作用(即通过电子相关性增强),并且在从Sc到Mn的整个序列中平滑变化。 Sc〜(2 +),Ti〜(2 +),V〜(2 +),Cr〜(2+)和Mn〜(2+)的高自旋络合物是MH_2〜( 2+)系统。然而,对于Cr〜(2 +),Cr的较大的第二电离能导致电荷交换反应Cr〜(2+)+ H_2→Cr〜+ + H_2〜+与静电配合物竞争。将计算出的特性与相应的单正离子的特性进行比较。

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