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首页> 外文期刊>Chemical Physics Letters >RELATIVISTIC STUDY OF NUCLEAR MAGNETIC SHIELDING CONSTANTS - MERCURY DIHALIDES
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RELATIVISTIC STUDY OF NUCLEAR MAGNETIC SHIELDING CONSTANTS - MERCURY DIHALIDES

机译:核磁屏蔽常数-巯基的相对论研究

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摘要

Relativistic ab initio calculations of the Hg-199 nuclear magnetic shielding constant and the chemical shift of HgX(2) (X = Cl, Br, I) are presented. The method is a combination of the relativistic spin-free no-pair theory of Sucher and Hess and the spin-orbit unrestricted Hartree-Fock (SO-UHF) method reported previously. For the Hg-199 shielding constant, both the spin-free relativistic (SFR) term, like mass-velocity and Darwin terms, and the SO term are important and they strongly couple with each other. Without them the experimental trend in mercury dihalides cannot be explained even qualitatively. Since these relativistic terms stabilize the orbitals closer to the nucleus, a basis set having larger freedom near the nucleus is appropriate. [References: 24]
机译:提出了Hg-199核磁屏蔽常数的相对论从头算和HgX(2)(X = Cl,Br,I)的化学位移。该方法是Sucher和Hess的相对论无自旋无对理论与先前报道的自旋轨道无限制Hartree-Fock(SO-UHF)方法的结合。对于Hg-199屏蔽常数,无旋转相对论(SFR)术语(如质量速度和达尔文术语)和SO术语都很重要,它们彼此紧密耦合。没有它们,就不能定性地解释二卤化汞的实验趋势。由于这些相对论项使靠近原子核的轨道稳定,因此在原子核附近具有较大自由度的基集是合适的。 [参考:24]

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