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[求助]
castep計算拉曼光譜中的聲子問題
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用castep計算拉曼光譜,里面涉及到了聲子的計算,但每次聲子計算都出錯,提示說是沒有優(yōu)化結(jié)構(gòu),但是結(jié)構(gòu)我優(yōu)化過了啊,而且它說的這兩個參數(shù)也達到了,不知道這到底是怎么回事?怎么才能解決這個問題,請高手賜教。 ? *ERROR* in PHONON calculation: Prerequisite GEOMETRY OPTIMISATION ? ? has not been performed or is not converged to sufficient accuracy. ? ? ? ? Maximum force |F|max = 2.540 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 2.540 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 ? ? ? ???????????????????????????????????????????????????????????????????????????????? ERROR: Phonon run aborted because of unoptimised geometry. See Ni_OH_2_Efield.castep for more details Current trace stack: phonon_check_geometry phonon_calculate castep MPI Application rank 0 exited before MPI_Finalize() with status 1 |

金蟲 (小有名氣)
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