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0506nan

木虫 (小有名气)

[求助] VASP中如何在体系中引入电子和空穴

各位精通VASP的大虾们,我刚看到一篇文献,关于在体系中引入电子和空穴的:
Photoexcitation of electron hole pairs in titania results in charge separation, with electrons available to participate in the CO2 reduction. Here, we assume that the dynamics of charge separation is much faster than electron transfer to CO2; therefore the electrons available for reduction are thermalized to the bottom of TiO2 conduction band (CB), which is about 3.8 eV below the vacuum level.17 Photoexcited electrons are modeled
by introduction of an extra electron into the system, which populates the conduction band of TiO2. The holes which compensate these electrons and interact with them electrostatically are modeled in three possible ways: (i) completely screened and having no influence (model I); (ii) positive background charge (model II); (iii) localized positive charge in the vicinity,modeled by a proton (model III).

J. Phys. Chem. C 2010, 114, 21474–21481

这三个模型是怎么建的啊???VASP中可以同时引入电子和空穴吗?好像MS中不可以啊!没用过VASP,所以不明白这三个模型是怎么建的。

知道的请解释一下,不胜感激!俺比较穷,悬赏10个金币吧^_^
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贺仪

铁杆木虫 (著名写手)

引用回帖:
Originally posted by 0506nan at 2011-06-22 09:43:36:
你好!文献中的第二种模型是怎么建的啊?(ii) positive background charge (model II),他前面已经加入了额外电子,这正电荷背景是怎么加的啊

不好意思 ,我没看清楚。刚看了感觉也不知道怎么回事,估计文章里面又说用什么软件吧,也应该会有再详细一点的东西
嘟啦啦嘟啦啦嘟
4楼2011-06-22 10:09:06
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贺仪

铁杆木虫 (著名写手)

【答案】应助回帖


zzy870720z(金币+1): 谢谢指教 2011-06-22 10:07:08
通过设置电子数来实现,NELECT=体系所有电子数-1 空穴,+1就是电子
嘟啦啦嘟啦啦嘟
2楼2011-06-22 09:21:11
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0506nan

木虫 (小有名气)

引用回帖:
Originally posted by 贺仪 at 2011-06-22 09:21:11:
通过设置电子数来实现,NELECT=体系所有电子数-1 空穴,+1就是电子

你好!文献中的第二种模型是怎么建的啊?(ii) positive background charge (model II),他前面已经加入了额外电子,这正电荷背景是怎么加的啊
人应当一切都美,外貌、衣裳、灵魂、思想...
3楼2011-06-22 09:43:36
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0506nan

木虫 (小有名气)

引用回帖:
Originally posted by 贺仪 at 2011-06-22 10:09:06:
不好意思 ,我没看清楚。刚看了感觉也不知道怎么回事,估计文章里面又说用什么软件吧,也应该会有再详细一点的东西

模型1用的gaussian03,模型2和模型3用的VASP。 To account for the presence of an electron from photoexcitation, either an extra electron with a positive compensating background (model II) or one hydrogen atom adsorbed on the surface bridging O atom (model III) is introduced to populate the TiO2 conduction band. In the latter case, the electron from the hydrogen atom redistributes to the
bottom of CB of TiO2 within self-consistent calculations leaving behind a proton mimicking a localized hole in terms of its Coulomb potential as long as it does not participate in reactions. In contrast, we consider the positive charge to be completely screened in our cluster calculations.
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5楼2011-06-22 10:22:19
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