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newton3915鐵桿木蟲(chóng) (正式寫(xiě)手)
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[交流]
【求助】聲子譜計(jì)算 已有5人參與
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我在計(jì)算碳納米管的聲子譜時(shí)出現(xiàn)下面的問(wèn)題 *ERROR* in PHONON calculation: Prerequisite GEOMETRY OPTIMISATION ? ? has not been performed or is not converged to sufficient accuracy. ? ? ? ? Maximum force |F|max = 0.1693 eV/A ? ? Parameter GEOM_FORCE_TOL = 0.5000E-01 eV/A ? ? ? ? This could be because of any of the following ? ? (a) No geometry optimisation was performed ? ? (b) A geometry optimisation failed to converge ? ? (c) An error was made copying the optimised geometry to this .cell file ? ? (d) Cutoff, k-point sampling or other convergence parameter differ ? ? from the geometry optimisation run to this one. ? ? Please check your input parameters and if necessary run or re-run a ? ? geometry optimisation calculation. ? ? ? ? Alternatively increase value of GEOM_FORCE_TOL to 0.1693 or greater ? ? to allow this run to proceed at risk of inaccurate phonon frequencies. ? ? ? ? Typically a force tolerance convergence of 0.025 eV/A is necessary to ? ? obtain well converged phonon frequencies althout a smaller value can be ? ? required in the presence of weak forces, e.g. in molecular crystals 貌似說(shuō)我沒(méi)有幾何優(yōu)化,但是我之前進(jìn)行了幾何優(yōu)化而且都收斂了啊。 收斂精度都是ultrafine的。大家知道是什么問(wèn)題嗎? |
鐵桿木蟲(chóng) (正式寫(xiě)手)
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