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didi5158

金虫 (小有名气)

[交流] 【求助】关于castep中力的测试!

最近希望计算材料的振动光谱,学习了Ms帮助中关于计算phonon的部分。
帮助中强烈建议进行force与K点密度的测试,内容如下:
the safest procedure is to investigate the convergence of the forces as a function of calculation parameters - primarily the k-point sampling. It is recommended that you carry out a series of single-point energy calculations using increasingly dense k-point meshes. Monitor the convergence of the forces until they converge to within the force tolerance criterion.
请问一下大家,帮助中提到的forces收敛是指的每个原子还是整个晶胞受的total force?
在castep的outfile中只有每个原子收的力,如何来判断它的收敛?
知道了每个原子受力如何求晶胞的总受力值?
谢谢大家了!!!
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