| 2 | 1/1 | 返回列表 |
| 查看: 1866 | 回復(fù): 1 | |||
cenwanglai榮譽(yù)版主 (知名作家)
|
[交流]
【求助完畢】怎么用第一性原理分子動(dòng)力學(xué)來做復(fù)雜結(jié)構(gòu)的粗優(yōu)化?
|
|
凝聚態(tài)和固體表面催化反應(yīng)相關(guān)計(jì)算都有建模型和對(duì)模型的結(jié)構(gòu)優(yōu)化的步驟,復(fù)雜的初始結(jié)構(gòu)的優(yōu)化往往是非常痛苦和耗時(shí)的過程。如果能夠用先第一性原理分子動(dòng)力學(xué)來做復(fù)雜結(jié)構(gòu)的粗優(yōu)化,再按照正常的DFT計(jì)算來做結(jié)構(gòu)優(yōu)化,可能會(huì)極大的縮短時(shí)間。 下面一篇文章在TiO2面上放兩層Au原子條帶作為催化劑模型,初始結(jié)構(gòu)就是先用分子動(dòng)力學(xué)來優(yōu)化的。 Zhi-Pan Liu etc. PRL. Catalytic Role of Metal Oxides in Gold-Based Catalysts: A First Principles Study of CO Oxidation on TiO2 Supported Au. To obtain a physically meaningful structure for the Au/TiO2 composite system, Nose thermostat molecular dynamics simulation (T = 200 K, 5 fs/step, 500 steps) was performed. Five low energy structures were selected and each one was further optimized by a conjugate gradients procedure. The lowest energy structure was then used for all subsequent studies. In all calculations, the Au atoms and the top three layers of TiO2(110) surface were relaxed, keeping the rest of the TiO2 atoms fixed at their bulk-truncated positions. Nose thermostat molecular dynamics simulation 看起來是針對(duì)恒溫系綜的。對(duì)于一般的supercell體系,是不是就是NVT系綜呢? Vasp 做分子動(dòng)力學(xué)模擬設(shè)置 SMASS>0(Nose mass parameter.)(此時(shí)默認(rèn)IBRION=0),就會(huì)用Nose算法模擬正則系綜。但是,如何如上面一段英文那樣得到Five low energy structures呢? [ Last edited by cenwanglai on 2011-5-15 at 22:10 ] |
» 搶金幣啦!回帖就可以得到:
+5/350
+1/85
+1/84
+1/57
+1/53
+1/37
+1/37
+2/32
+1/31
+2/26
+1/14
+1/11
+1/7
+1/6
+1/6
+1/6
+1/3
+1/3
+1/2
+1/1
榮譽(yù)版主 (知名作家)
| 2 | 1/1 | 返回列表 |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 070300化學(xué)319求調(diào)劑 +6 | 錦鯉0909 2026-03-17 | 6/300 |
|
|---|---|---|---|---|
|
[考研] 一志愿985,本科211,0817化學(xué)工程與技術(shù)319求調(diào)劑 +6 | Liwangman 2026-03-15 | 6/300 |
|
|
[考研] 302求調(diào)劑 +10 | 呼呼呼。。。。 2026-03-17 | 10/500 |
|
|
[考研] 281求調(diào)劑(0805) +4 | 煙汐憶海 2026-03-16 | 11/550 |
|
|
[考研] 299求調(diào)劑 +5 | △小透明* 2026-03-17 | 5/250 |
|
|
[考研] 生物學(xué)071000 329分求調(diào)劑 +3 | 我愛生物生物愛?/a> 2026-03-17 | 3/150 |
|
|
[考研] 211本,11408一志愿中科院277分,曾在中科院自動(dòng)化所實(shí)習(xí) +6 | Losir 2026-03-12 | 7/350 |
|
|
[考研] 考研調(diào)劑 +3 | 淇ya_~ 2026-03-17 | 5/250 |
|
|
[考研] 333求調(diào)劑 +3 | 文思客 2026-03-16 | 7/350 |
|
|
[考研] 304求調(diào)劑 +4 | ahbd 2026-03-14 | 4/200 |
|
|
[考研] 085600調(diào)劑 +5 | 漾漾123sun 2026-03-12 | 6/300 |
|
|
[考研] 0703化學(xué)調(diào)劑,求各位老師收留 +8 | 秋有木北 2026-03-14 | 8/400 |
|
|
[考研] 070303 總分349求調(diào)劑 +3 | LJY9966 2026-03-15 | 5/250 |
|
|
[考研] 294求調(diào)劑 +3 | Zys010410@ 2026-03-13 | 4/200 |
|
|
[考研] 材料工程327求調(diào)劑 +3 | xiaohe12w 2026-03-11 | 3/150 |
|
|
[考研] 266求調(diào)劑 +4 | 學(xué)員97LZgn 2026-03-13 | 4/200 |
|
|
[考研] 材料與化工求調(diào)劑一志愿 985 總分 295 +8 | dream…… 2026-03-12 | 8/400 |
|
|
[考研] 工科,求調(diào)劑 +3 | 我887 2026-03-11 | 3/150 |
|
|
[考研] 329求調(diào)劑 +3 | miaodesi 2026-03-12 | 4/200 |
|
|
[碩博家園] 085600 260分求調(diào)劑 +3 | 天空還下雨么 2026-03-13 | 5/250 |
|