| 查看: 409 | 回复: 2 | |||
| 当前主题已经存档。 | |||
| 【有奖交流】积极回复本帖子，参与交流，就有机会分得作者 zhangyy427 的 12 个金币 | |||
zhangyy427铜虫 (正式写手)
|
[交流]
Car-Parrinello molecular-dynamics(MD) simulations 这是什么意思啊？
|
||
| Car-Parrinello molecular-dynamics(MD) simulations 这是什么意思啊？ 它是怎么回事啊 不懂 欢迎大家讨论啊 |
回复此楼» 猜你喜欢
中南大学易小艺课题组诚招2026申请-考核制博士生
已经有0人回复
-
海南师范大学招收化学博士（光电功能材料课题组招收博士研究生）
已经有11人回复
-
无机化学论文润色/翻译怎么收费?
已经有133人回复
-
求助几个团簇的cif
已经有0人回复
-
急求该反应的详细机理
已经有5人回复
-
【Ei | Scopus 双检索】2026年智能交通与未来出行国际会议（CSTFM 2026）
已经有0人回复
-
【EI|Scopus 双检索】2026年第六届机器人与人工智能国际会议（JCRAI 2026）
已经有0人回复
-
zotero的advanced material模板没有更新，有人有新版的cls文件吗
已经有2人回复
-
【高校联合举办】2026年第五届服务机器人国际会议（ICoSR 2026）
已经有0人回复
2楼2009-07-08 22:19:24
tianlangxingaa
铁杆木虫 (著名写手)
- 应助: 52 (初中生)
- 贵宾: 0.02
- 金币: 7464.2
- 红花: 19
- 帖子: 1283
- 在线: 735.1小时
- 虫号: 438857
- 注册: 2007-09-30
- 专业: 理论和计算化学
★
paopaomeng(金币+1,VIP+0):谢谢交流 7-8 22:44
paopaomeng(金币+1,VIP+0):谢谢交流 7-8 22:44
|
The Car–Parrinello method is a type of ab initio (first principles) molecular dynamics, usually employing periodic boundary conditions, planewave basis sets, and density functional theory. In contrast to Born–Oppenheimer molecular dynamics wherein the nuclear (ions) degree of freedom are propagated using ionic forces which are calculated at each iteration by approximately solving the electronic problem with conventional matrix diagonalization methods, the Car–Parrinello method explicitly introduces the electronic degrees of freedom as (fictitious) dynamical variables, writing an extended Lagrangian for the system which leads to a system of coupled equations of motion for both ions and electrons. In this way an explicit electronic minimization at each iteration is not needed: after an initial standard electronic minimization, the fictitious dynamics of the electrons keep them on the electronic ground state corresponding to each new ionic configuration visited along the dynamics, thus yielding accurate ionic forces. In order to maintain this adiabaticity condition, it is necessary that the fictitious mass of the electrons is chosen small enough to avoid a significant energy transfer from the ionic to the electronic degrees of freedom. This small fictitious mass in turn requires that the equations of motion are integrated using a smaller time step than the ones (1–10 fs) commonly used in Born–Oppenheimer molecular dynamics, but it is possible to extend the Car–Parrinello formalism in order to overcome this limitation. |
3楼2009-07-08 22:35:04
