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largehoo木蟲 (小有名氣)
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[求助]
求助~ 關(guān)于 VASP 和 NAO 基組
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最近在用VASP重復(fù)一篇文獻(xiàn)中的計(jì)算 原文用的是 FHI-aims (Frit-Haber-Institut ab initio molecular simulations code)程序,在計(jì)算中用到了1階NAO基組(tier 1 NAO basis)和3階NAO基組(tier 3 NAO basis)。 在參考文獻(xiàn)中看到這樣的內(nèi)容: FHI-aims NAO basis sets for cerium: tier 1:[Xe]+2s2p2d2f 1g; tier 2: [Xe]+3s3p4d3f 2g1h; and tier 3: [Xe]+4s4p5d5f 3g2h. 以及看到smutao在量子化學(xué)區(qū)發(fā)帖提到: NAO – (Natural Atomic Orbital) natural orbital – those orbitals for which the first-order density matrix is diagonal; each will contain some non-integer number of electrons between 0 and 2. Usually discussed in the context of a correlated calculation. RHF calculations give molecular orbitals that are also natural orbitals. The NOs are the orbitals for which the CI expansion converges fastest. Particularly valuable in modeling organometallic complexes. 請問如何在VASP中實(shí)現(xiàn) tier 1/3 NAO basis 的計(jì)算,或者有什么替代的方法? 忘大家不吝賜教,指點(diǎn)迷津 |
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