Analytical potential energy function for the ground state $$
(\tilde X^1 A_1 )
$$ of hydrogen isotopic D2O molecule |
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Authors: | Wen Ruan WenLang Luo Li Zhang and ZhengHe Zhu |
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Institution: | (1) Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610065, China;(2) College of Mathematics and Physics, Jinggangshan University, Ji’an, 343009, China |
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Abstract: | The present work is to construct the potential energy function of isotopic molecules. The so-called molecular potential energy
function is the electronic energy function under Born-Oppenheimer approximation, in which the nuclear motions (translational,
rotational and vibration motions) are not included, therefore, its nuclear vibration motion and isotopic effect need to be
considered. Based on group theory and atomic and molecular reactive statics (AMRS), the reasonable dissociation limits of
D2O are determined, its equilibrium geometry and dissociation energy are calculated by density-functional theory (DFT) B3lyp,
and then, using the many-body expansion method the potential energy function of D2O is obtained for the first time. The potential contours are drawn, in which it is found that the reactive channel D + OD→D2O has no threshold energy, so it is a free radical reaction. But the reactive channel O + DD→D2O has a saddle point. The study of collision for D2O is under way.
Supported by the National Natural Science Foundation of China (Grant No. NSAF10676022) |
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Keywords: | D2O gif" alt="$$
(\tilde X^1 A_1 )
" target="_blank">$$" align="middle" border="0"> isotopic effect many-body expansion theory analytical potential energy function |
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