| 查看: 590 | 回复: 1 | |||
[交流]
【求助完毕】NEB过渡态计算neb.dat中force的正负是什么意思?
|
|
这是我在官网论坛上提的问题(http://theory.cm.utexas.edu/foru ... 27&p=2933#p2933),请教! I have got a neb.dat read like below: 0 0.000000 0.000000 -0.010838 0 1 0.867271 -0.837088 -1.279897 1 2 1.768503 -1.026423 -1.128849 2 3 2.584773 -0.937171 -2.621561 3 4 3.429818 -0.846114 -0.975741 4 5 4.433803 -1.987181 -2.796546 5 6 5.509804 -2.035966 -3.951533 6 7 6.561177 -2.989551 0.890184 7 8 7.546694 -2.312575 -0.077526 8 (1)What does a positive or a negative force item mean in the fourth column? Do the plus or minus sign directs the movement of the images? (2)The distance between two nearby images is supposed to be lower than 1 Angstrom? (3)Can anyone give me some advice about the 7th line with the lowest energy? The 8th line has been relaxed to ground state and is supposed to be CO-adsorbed-slab Final State. And the first line stands for configuration that CO in the vacuum off the slab surface. [ Last edited by cenwanglai on 2011-3-19 at 15:27 ] |
» 猜你喜欢
086000生物与医药 初试274求调剂
已经有6人回复
考研调剂
已经有3人回复
材料调剂
已经有3人回复
349求调剂
已经有5人回复
348求调剂
已经有9人回复
找调剂
已经有4人回复
材料专硕322分
已经有7人回复
一志愿南昌大学324求调剂
已经有8人回复
材料调剂
已经有8人回复
环境工程调剂
已经有9人回复
» 本主题相关价值贴推荐,对您同样有帮助:
金属锌五配位的,如何通过计算判断其为三角双锥还是四方锥
已经有9人回复
请问光子态密度(photonic mode density)的确切物理含义为何?
已经有5人回复
NEB计算扩散路径的力收敛精度设置问题
已经有16人回复
vasp计算neb忽然停掉了!如果想继续算我应该怎么办呐?
已经有8人回复
NEB计算过渡态和反应路径
已经有9人回复
计算neb出错,请高手帮忙看看
已经有27人回复
新手请教用NEB方法计算energy barrier.
已经有15人回复
vasp用neb计算迁移势垒
已经有11人回复
【文献学习】JACS上一篇纯DFT计算的文献: CI-NEB计算,Leuwdin布局分析,态密度分析
已经有30人回复
【求助】NEB算过渡态出现致命错误
已经有5人回复
【其他】vasp neb 计算讨论
已经有20人回复
【求助成功】怎么样提高NEB计算速度?
已经有19人回复
【讨论】NEB寻找过渡态专题讨论
已经有49人回复
» 抢金币啦!回帖就可以得到:
西安征结婚女友
+1/275
【招聘】温州医科大学/附属医院/瓯江实验室李校堃院士团队诚聘博士后和科研人员
+1/181
青岛大学功能纺织品与先进材料研究院2026硕士研究生招生调剂
+1/88
欢迎调剂到赣南师范大学智能制造与未来能源学院
+2/76
福建师范大学海峡柔性电子学院招收2026级调剂硕士研究生(化学/物理学/材料工程)
+1/40
天津理工大学功能晶体研究院(晶体材料全国重点实验室)杰青团队招收2026年硕士研究生
+1/39
西京学院土木水利 2026 级研究生招生
+2/30
西南科技大学杨文彬教授课题组接收材料、化工、化学类专业研究生调剂 。
+1/18
西北工业大学机电学院 复合材料加工制造方向招聘博士后
+1/12
招聘科研助理——储能方向(储能、流体传热、CFD模拟)
+1/12
广东唯一石化院校——资源与环境专硕招生
+1/11
博士招生 | 青岛科技大学(高分子、化学、材料、力学、航天、机电工程、计算机仿真)
+1/10
【上海调剂】985联合培养!别错过能送你去北大/交大/同济/中科院的神仙导师!
+1/8
江西水利电力大学接收调剂08工学皆可
+1/6
招生材料与化工、环境科学调剂研究生
+1/5
三峡大学环境功能材料课题组招生化学、材料、化工硕士调剂生
+1/5
杭州师范大学-浙江省湿地智慧监测与生态修复重点实验室团队硕士调剂公告
+1/4
中国科学院大学纳米科学与技术学院-罗聃课题组诚招硕士研究生
+1/2
招聘硕博生:基于机器学习和人工智能的结构/合金设计-西安交大
+1/2
211/双一流---石河子大学---有机化学方向招调剂生
+1/2
★ ★
zzy870720z(金币+2): 谢谢总结 2011-03-19 16:42:51
zzy870720z(金币+2): 谢谢总结 2011-03-19 16:42:51
|
I got a response from graeme: It is a little tricky to see what's going on from a list of numbers, but here's a guess. There does not appear to be a barrier for adsorption on the surface since the energy decreases from image 0->2. We typically use the NEB to find pathways between stable states. There may be a local minimum near image #2, but there is certainly a more stable adsorption geometry near image #7 which should be minimized. Then, consider what you are trying to calculate. If there is no barrier for adsorption, this band may only tell you that the energy drops as you go from CO in vacuum to CO on the surface. If that is the case, there is no need for finding a minimum energy pathway. Column 4 is the force projected along the band. A negative force means that the energy is going down along the band and a positive force means that it is going up. The distance between images can be smaller than 1 Ang. If you used twice the number of images to represent the same band, the distance between images will decrease by a factor of two. In the limit of many images, that distance between images can be arbitrarily small. There are no interatomic interactions between images along the band. [ Last edited by cenwanglai on 2011-3-19 at 15:32 ] |
2楼2011-03-19 15:29:54














回复此楼