Full relativistic calculations of the quadrupole and electric field gradients for C2, N2, and O2 |
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Authors: | Zhang Li Zhu Zheng-He |
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Affiliation: | Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China |
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Abstract: | In the present work we calculate the energies, quadrupole moments, and electric field gradients (EFGs) of molecules C2, N2, and O2 based on DIRRCI method with basis aug-cc-pVTZ-DK. We prove that the quadratic force constant k2 is the product of charge and EFG at its equilibrium nuclear distance. The dipole charge distributions for these symmetrical molecules are all in equilibrium, however, the quadrupole charge distributions are far from equilibrium, among these, there is the most remarkable deviation from equilibrium for N2, for its many charges concentrate on two sides of molecule, which is in agreement with the well-known characteristic of nitrogen molecule. The relativistic effect is remarkable even for the same period. |
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Keywords: | quadrupole moment electric field gradients the full relativistic quantum mechanics |
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