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n型摻雜Fe2O3的電子輸運性質(zhì)(Nano Letter, 2011):embedded cluster + ECPs
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這篇文章的技術(shù)難點在哪里?新穎性在哪里?計算軟件是NWChem+Gamess (謝謝souledge的提醒). 文中有以下幾處我不明白: (1) 下面Figure 1中兩個Cluster,為什么左邊帶15個負電荷,右邊有21個負電荷?Figure 1的caption說沒有顯示capping ECPs和point charge arrays.那么如果把這兩項內(nèi)容顯示出來,會是個什么情況? (2) capping aluminum effective core potentials (ECPs)是什么?文中說這兩個clusters中,capping aluminum effective core potentials are used to replace Fe(III) cations that would have been bonded to the terminating oxygen anions.Use of such ECPs prevents electron density on the oxygen anions from artificially drifting outward, by providing effective Pauling repulsion at nearest neighbor cation sites. Al ECPs are used because they have similar ionic radii to Fe(III) cations.為什么這里可以用Al的ECP來取代Fe(III)離子?這段話在說什么? (3)文中公式(3)下面一段話中說“The clusters with capping ECPs are embedded in a large point charge array meant to represent the extended ionic crystal, where charges of +3 and -2 represent Fe and O ions in the bulk, repectively, and the charges of ions on the edges or surfaces are determined through Evjen's method. The clusters and point charge arrays are built from the experimental crystal structure.”似乎給出了構(gòu)建模型的重要信息,特別是點電荷陣列,說是根據(jù)實驗的晶體結(jié)構(gòu)建立的。這段話在說什么?怎么樣根據(jù)這樣的信息來建立這樣的模型? (4)NWChem也是可以計算CASSCF,為什么這篇文章的作者要用Gamess算CASSCF呢? @zhangguangping @valenhou001 @yjcmwgk @aylayl08 [ Last edited by cenwanglai on 2012-8-25 at 14:16 ] |
Photochemistry |
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專家顧問 (著名寫手)
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有交代啊~其中NWChem可是算分子之類的好手,記得能夠進行MP2,CCSD(T)的計算的~ 順便,看那結(jié)構(gòu)圖的原子光線,就不像是與VASP經(jīng)常搭配的p4vasp或者VESTA那樣的單光源軟件~色彩風格上比較像V_Sim~ [ Last edited by souledge on 2012-8-20 at 23:19 ] |
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