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arXiv 0806.4913physics.chem-phphysics.comp-ph
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$H_3O_2^-$及其同位素振动基态的全维量子动力学研究

A full-dimensional quantum dynamical study of the vibrational ground state of $H_3O_2^-$ and its isotopomers

Yonggang Yang, Oliver Kühn

摘要:

采用九维量子动力学模型研究了氘代对水合氢氧负离子振动基态的影响。核波函数的传播已与多组态含时Hartree方法得到的零点能正常和完全氘代物种在定量协议与以前的扩散蒙特卡罗计算。根据零点能,与氘的情况相比,在桥连位置具有氢原子的同位素异构体更稳定约1 kJ/mol。这与两个OH基团的氘化状态无关。我们还报告了二级几何H/D同位素效应的O-O距离相当于约0.005 A的对称同位素异构体和0.009 A的不对称的情况下的伸长率。最后,我们探讨了由于两个OH基团的扭转运动引起的基态隧穿劈裂的同位素敏感性。

英文摘要:

We investigated the effect of deuteration on the vibrational ground state of the hydrated hydroxide anion using a nine-dimensional quantum dynamical model for the case of J=0. The propagation of the nuclear wave function has been performed with the multi-configuration time-dependent Hartree method which yielded zero-point energies for the normal and fully deuterated species in quantitative agreement with previous diffusion Monte Carlo calculations. According to the zero-point energy the isotopomers having the hydrogen atom in the bridging position are more stable by about 1 kJ/mol as compared to the deuterium case. This holds irrespective of the deuteration state of the two OH groups. We also report the secondary geometric H/D isotope effect on the O--O distance which amounts to an elongation of about 0.005 A for the symmetric isotopomers and 0.009 A in the asymmetric case. Finally, we explore the isotopomer sensitivity of the ground state tunneling splitting due to the torsional motion of the two OH groups.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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