| 查看: 464 | 回复: 2 | |||
| 当前主题已经存档。 | |||
[交流]
自旋污染求助
|
|||
|
最近做的一个体系自旋污染大的惊人,请教高手 输入:# b3lyp/6-311+g(2d,p) pop=NBO scf=(maxcycle=500, tight) Charge = 0 Multiplicity = 2 输出: SCF Done: E(UB+HF-LYP) = -5204.25052453 A.U. after 32 cycles Convg = 0.6735D-08 -V/T = 2.0016 S**2 = 1.9323 Annihilation of the first spin contaminant: S**2 before annihilation 1.9323, after 2.5168 高斯公司回信:I agree that this is a large value for S**2 but this really is a statement about system rather than something you can control. 1) have you check the stability of the wavefunction? You have a number of negative eigenvalues, run STABLE=Opt Guess=Read 2) are you sure that a doublet is the lowest energy state, a large value for S**2 says the alpha and beta orbitals are different, this can occur if you have the highest beta occupied different from the alpha orbitals where it may be unoccupied. Again stability may switch this or higher spin states may be more stable. Try both of these. 可我做了STABLE=Opt 后发现波函数是稳定的 Eigenvectors of the stability matrix: Eigenvector 1: ?Spin -A' Eigenvalue= 0.0295043 111A ->112A 0.93202 110B ->111B -0.18620 110B ->113B -0.10726 The wavefunction is stable under the perturbations considered. The wavefunction is already stable. The wavefunction is already stable. 而且我也作了四重态,发现二重态比四重态的能量低,现在不知道该怎么办了,还请高手指点, 谢谢! |
» 猜你喜欢
河海大学 (211.双一流高校)钙钛矿光电实验室丁勇团队欢迎有志青年!
已经有3人回复
一志愿南大理论与计算化学方向(070300)342分,求调剂
已经有1人回复
物理化学论文润色/翻译怎么收费?
已经有167人回复
欢迎化学、化工、物理、材料、或计算机背景的考研咨询
已经有0人回复
黑龙江省原子能研究院化学课题组招收2026级化学专业或化学相关专业硕士生
已经有0人回复
26博士申请
已经有0人回复
河南理工大学化工学院招收调剂生啦!
已经有1人回复
湖北文理学院材料与化工专硕还有调剂名额,欢迎大家推荐考生!
已经有1人回复
招收博士一名-宁波大学
已经有0人回复
【接测试】TPD-TPR、TPO、脉冲吸附、原位红外,电化学原位红外,站内联系
已经有0人回复
beefly
专家顾问 (职业作家)
地沟油冶炼专家
-

专家经验: +459 - QC强帖: 12
- 应助: 88 (初中生)
- 金币: 13386
- 散金: 27307
- 红花: 302
- 帖子: 4685
- 在线: 929小时
- 虫号: 408372
- 注册: 2007-06-21
- 性别: GG
- 专业: 理论和计算化学
- 管辖: 计算模拟

2楼2008-01-13 01:03:03
3楼2008-01-13 20:31:57









回复此楼