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本帖最后由 Tanmin 于 2019-5-20 11:16 编辑
各位大家好:
最近在用MS模拟物质Raman谱时,软件显示计算成功,但分析时,出现下图错误:
请各位多多指导
下面是计算参数,经过convergence testing
task : GeometryOptimization
comment : CASTEP calculation from Materials Studio
xc_functional : PW91
spin_polarized : false
opt_strategy : Default
page_wvfns : 0
cut_off_energy : 700.000000000000000
grid_scale : 2.000000000000000
fine_grid_scale : 3.000000000000000
finite_basis_corr : 2
finite_basis_npoints : 3
elec_energy_tol : 2.000000000000000e-006
max_scf_cycles : 200
fix_occupancy : true
nextra_bands : 0
num_dump_cycles : 0
geom_energy_tol : 5.000000000000000e-006
geom_force_tol : 0.010000000000000
geom_stress_tol : 0.020000000000000
geom_disp_tol : 5.000000000000000e-004
geom_max_iter : 100
geom_method : BFGS
fixed_npw : false
geom_modulus_est : 500.000000000000000 GPa
calculate_ELF : false
calculate_stress : true
popn_calculate : false
calculate_hirshfeld : false
calculate_densdiff : false
pdos_calculate_weights : false
task : Phonon+Efield
continuation : default
comment : CASTEP calculation from Materials Studio
xc_functional : PW91
spin_polarized : false
opt_strategy : Default
page_wvfns : 0
cut_off_energy : 700.000000000000000
grid_scale : 2.000000000000000
fine_grid_scale : 3.000000000000000
finite_basis_corr : 2
finite_basis_npoints : 3
elec_energy_tol : 1.000000000000000e-010
elec_eigenvalue_tol : 1.000000000000000e-009
max_scf_cycles : 200
fix_occupancy : true
nextra_bands : 0
num_dump_cycles : 0
efield_ignore_molec_modes : crystal
efield_calc_ion_permittivity : true
phonon_max_cycles : 100
phonon_sum_rule_method : reciprocal
efield_energy_tol : 1.000000000000000e-005
excited_state_scissors : 0.000000000000000e+000
calculate_born_charges : true
born_charge_sum_rule : true
bs_max_iter : 200
efield_max_cycles : 500
calculate_raman : true
raman_range_low : 0.000000000000000e+000 cm-1
raman_range_high : 1.000000000000000e+004 cm-1
backup_interval : 900
pdos_calculate_weights : false
spectral_write_eigenvalues : false
下面是-efiled.castep 文件中的内容:
Warning in parameters_validate: current value of
ELEC_EIGENVALUE_TOL = 0.100000E-08eV
is too large to achieve desired level of convergence of response properties.
This may cause convergence failures and/or inaccuracy of results
of PHONON+EFIELD calculations - recommend you use a smaller value, e.g.
ELEC_EIGENVALUE_TOL = 0.583333E-10eV
Initialising basis set for model.
Reinitialising basis set for current geometry.
Continuing from previous run with ground state wavefunction.
Continuing from previous run with ground state density.
Info: BACKUP_INTERVAL modified from 0 to 900
Info: ELEC_ENERGY_TOL modified from 0.2000000000000000E-05 eV to 0.1000000000000000E-09 eV
Info: ELEC_EIGENVALUE_TOL modified from 0.1000000000000000E-05 eV to 0.1000000000000000E-08 eV
Info: BS_MAX_ITER modified from 60 to 200
Info: PHONON_MAX_CYCLES modified from 50 to 100
Info: CALCULATE_RAMAN modified from F to T
Info: RAMAN_RANGE_HIGH modified from 1.000000000000000 eV to 1.239841929200420 eV
Info: EFIELD_MAX_CYCLES modified from 50 to 500
Info: SPECTRAL_WRITE_EIGENVALUES modified from T to F
WARNING: Ground state wavefunctions and density data in check file marked as unconverged.
because some parameters changed on continuation.
Calculation parallelised over 12 processes.
Data is distributed by k-point(12-way)
Vibrational Frequencies +
+ ----------------------- +
+ +
+ Performing frequency calculation at 1 wavevector (q-pt ) +
+ ========================================================================== +
+ +
+============================================================================+
+ Raman Intensity Progress Report +
+----------------------------------------------------------------------------+
+ RAMAN: Not a continuation; generating Raman intensities from beginning +
+----------------------------------------------------------------------------+
+ Mode 1: not Raman active; calculation not required +
+ Mode 2: not Raman active; calculation not required +
+ Mode 3: not Raman active; calculation not required +
+ Mode 4: performing Raman intensity calculation +
+ Mode number: 4 completed; time taken: 1130.47 seconds +
+ Checkpointing..... +
Writing analysis data to Al4C3_mp-632442_Efield.castep_bin
Writing model to Al4C3_mp-632442_Efield.check
+ Mode 5: performing Raman intensity calculation +
+ Mode number: 5 completed; time taken: 1112.86 seconds +
+ Checkpointing..... +
……………………………………………………为便于虫友查看,此次省略部分计算中间内容…………………………………………………………
+----------------------------------------------------------------------------+
+ E N D O F R A M A N I N T E N S I T Y C A L C U L A T I O N +
+ Raman intensity calculation completed in 20340.52 seconds +
+============================================================================+
+ -------------------------------------------------------------------------- +
+ q-pt= 1 ( 0.000000 0.000000 0.000000) 1.0000000000 +
+ -------------------------------------------------------------------------- +
+ Acoustic sum rule correction < 12.385066 cm-1 applied +
+ N Frequency ir intensity raman activity +
+ (cm-1) ((D/A)**2/amu) (A**4/amu) +
+ +
+ 1 -0.038186 0.0000000 0.0000000 +
+ 2 -0.031196 0.0000000 0.0000000 +
+ 3 -0.022058 0.0000000 0.0000000 +
+ 4 119.962794 6.7878338 4278.3122460 +
+ 5 156.579251 2.9536536 1714.4486269 +
+ 6 237.309866 0.8729072 3720.6925752 +
+ 7 239.260406 5.4126247 2858.4290772 +
+ 8 269.800560 9.1693299 16985.9192068 +
+ 9 307.592119 4.9199842 5630.1892928 +
+ 10 324.508650 20.2511256 9473.4043425 +
+ 11 390.981051 28.3528238 30248.0328004 +
+ 12 430.409968 7.0370798 3611.2560606 +
+ 13 458.187024 3.9590171 48080.5970025 +
+ 14 483.372487 17.9475001 15893.8888328 +
+ 15 496.447888 7.3642806 12008.9516531 +
+ 16 522.189379 48.2565305 33424.7536118 +
+ 17 551.058141 36.1193259 6076.5938836 +
+ 18 583.399120 4.2745716 12692.2891445 +
+ 19 601.070436 8.0126592 4388.6698821 +
+ 20 661.413769 28.3433146 15918.7213986 +
+ 21 746.522448 21.3010125 35454.5852783 +
==============================================================================
上图虽然显示了intensity,但经过与能够得出Raman图谱的数据相比,其少了很多内容。
经过自己对上面错误的分析,认为可能是计算精度不够,故对下面的参数做了如下修改。但任务运行后,显示任务运算成功,但分析Raman谱图时,任报相同的错误。
修改scf: medium to fine
修改k-point: 5,4,2 to 11,7,7
修改elec_eigenvalue_tol :0.58333333333332e-011
修改max_scf_cycles : 500
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