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本帖最后由 霜晨月 于 2021-10-27 16:51 编辑
(标题原来误写成SCF不收敛,已修改,抱歉)
我用Amber 18 + Orca 5.01 + xtb 6.4 跑一个酶的QM/MM动力学,QM区域是个有机小分子配体和几个氨基酸残基。
经常出现SCF不收敛的情况,而且不是一上来就不收敛,而是QM/MM MD正常跑了几百步、几千步之后出现不收敛。
(我仔细检查了MD轨迹和临时结构文件inpfile.xyz,未见结构异常。)
感觉XTB计算这么小的有机分子体系,SCF不收敛有些奇怪。请教各位老师问题可能出在何处?
这是Amber参数文件的相关设置:
&qmmm
qmmask=' XXXXXX ' ! These atoms should be treated using QM
qmshake=0, ! DO NOT SHAKE
qmcharge=1, ! Charge on QM region is +1
qm_theory='EXTERN',
qmcut=12.0 ! Use 12 angstrom cut off for QM region
qm_ewald=0 ! Required for qm_theory='EXTERN'
writepdb = 1
/
&orc
use_template=1,
/
这是ORCA template文件:
! XTB2
%pal nprocs 1 end
%maxcore 2000
错误信息:(orc_job.dat)
================================================================================
WARNINGS
Please study these warnings very carefully!
================================================================================
WARNING: Found dipole moment calculation with XTB calculation
===> : Switching off dipole moment calculation
WARNING: TRAH-SCF for XTB is not implemented!
===> : Turning TRAH off!
================================================================================
INPUT FILE
================================================================================
NAME = orc_job.inp
| 1> ! XTB2
| 2> %pal nprocs 1 end
| 3> %maxcore 2000
| 4> ! ENGRAD
| 5> ! Angs NoUseSym
| 6> %pointcharges "ptchrg.xyz"
| 7> *xyzfile 1 1 inpfile.xyz
| 8>
| 9> ****END OF INPUT****
================================================================================
-------------------------------------------------
| Calculation Setup |
-------------------------------------------------
program call : /opt/software/orca5.01/orca_5_0_1/otool_xtb orc_job_XTB.xyz --grad -c 1 -u 0 -P 1 --namespace orc_job --input orc_job_XTB.input.tmp --acc 0.100000
hostname : localhost.localdomain
calculation namespace : orc_job
coordinate file : orc_job_XTB.xyz
omp threads : 1
number of atoms : 63
number of electrons : 168
charge : 1
spin : 0.0
first test random number : 0.46629982145293
ID Z sym. atoms
1 6 C 1, 4, 6, 10, 12, 14, 20-29, 49-52
2 1 H 2, 3, 7, 9, 11, 13, 15-17, 19, 36-47, 53-63
3 7 N 5, 8, 30, 31
4 8 O 18, 32-35, 48
molecular fragmentation (1/2 indicates fragments):
111111111112222222222222222222222222222222222222222222222212222
# atoms in fragment 1/2: 12 51
fragment masses (1/2) : 82.10 343.40
CMA distance (Bohr) : 9.559
constraining FC (au) : 0.0500
-------------------------------------------------
| G F N 2 - x T B |
-------------------------------------------------
Reference 10.1021/acs.jctc.8b01176
* Hamiltonian:
H0-scaling (s, p, d) 1.850000 2.230000 2.230000
zeta-weighting 0.500000
* Dispersion:
s8 2.700000
a1 0.520000
a2 5.000000
s9 5.000000
* Repulsion:
kExp 1.500000 1.000000
rExp 1.000000
* Coulomb:
alpha 2.000000
third order shell-resolved
anisotropic true
a3 3.000000
a5 4.000000
cn-shift 1.200000
cn-exp 4.000000
max-rad 5.000000
q/qsh data taken from xtbrestart
CAMM data taken from xtbrestart
...................................................
: SETUP :
:.................................................:
: # basis functions 153 :
: # atomic orbitals 153 :
: # shells 93 :
: # electrons 168 :
: max. iterations 250 :
: Hamiltonian GFN2-xTB :
: restarted? true :
: GBSA solvation false :
: PC potential true :
: -> # point charges 1978 :
: -> sum of PC -0.3358700 e :
: electronic temp. 300.0000000 K :
: accuracy 0.1000000 :
: -> integral cutoff 0.3500000E+02 :
: -> integral neglect 0.1000000E-08 :
: -> SCF convergence 0.1000000E-06 Eh :
: -> wf. convergence 0.1000000E-04 e :
: Broyden damping 0.4000000 :
...................................................
iter E dE RMSdq gap omega full diag
1 -95.7691403 -0.957691E+02 0.223E+00 0.12 0.0 T
2 -96.1462537 -0.377113E+00 0.218E+00 0.26 1.0 T
3 -96.4393084 -0.293055E+00 0.927E-01 2.95 1.0 T
4 -96.4752596 -0.359512E-01 0.629E-01 2.57 1.0 T
5 -96.4865898 -0.113303E-01 0.478E-01 2.26 1.0 T
6 -96.4912654 -0.467562E-02 0.386E-01 1.71 1.0 T
7 -96.4969152 -0.564977E-02 0.224E-01 0.70 1.0 T
8 -95.6909752 0.805940E+00 0.233E+00 0.17 1.0 T
9 -96.4949687 -0.803993E+00 0.285E-01 1.11 1.0 T
10 -96.4952918 -0.323127E-03 0.275E-01 1.05 1.0 T
…………………………………………
221 -96.4979424 -0.158422E-02 0.176E-01 0.44 1.0 T
222 -96.4988412 -0.898797E-03 0.135E-01 0.11 1.0 T
223 -96.4984675 0.373624E-03 0.155E-01 0.33 1.0 T
224 -96.4775389 0.209286E-01 0.403E-01 0.07 1.0 T
225 -96.4957224 -0.181834E-01 0.261E-01 0.96 1.0 T
226 -96.4986269 -0.290448E-02 0.149E-01 0.31 1.0 T
227 -96.4754178 0.232091E-01 0.420E-01 0.07 1.0 T
228 -96.4955178 -0.201000E-01 0.268E-01 1.00 1.0 T
229 -96.4985244 -0.300666E-02 0.153E-01 0.32 1.0 T
230 -96.4818816 0.166429E-01 0.365E-01 0.07 1.0 T
231 -96.4962476 -0.143660E-01 0.244E-01 0.85 1.0 T
232 -96.4991079 -0.286029E-02 0.134E-01 0.27 1.0 T
233 -96.4447522 0.543557E-01 0.619E-01 0.05 1.0 T
234 -96.4921655 -0.474133E-01 0.360E-01 1.58 1.0 T
235 -96.4975483 -0.538278E-02 0.193E-01 0.54 1.0 T
236 -96.5011361 -0.358787E-02 0.502E-02 0.17 1.0 T
237 -96.4567729 0.443632E-01 0.550E-01 0.05 1.0 T
238 -96.4934069 -0.366340E-01 0.329E-01 1.38 1.0 T
239 -96.4978144 -0.440748E-02 0.182E-01 0.47 1.0 T
240 -96.5014928 -0.367838E-02 0.368E-03 0.15 3.4 T
241 -96.4989076 0.258520E-02 0.133E-01 0.11 1.0 T
242 -96.4984142 0.493423E-03 0.157E-01 0.34 1.0 T
243 -96.4903642 0.804994E-02 0.275E-01 0.09 1.0 T
244 -96.4971622 -0.679792E-02 0.209E-01 0.64 1.0 T
245 -96.5005857 -0.342356E-02 0.804E-02 0.19 1.0 T
246 -96.4363976 0.641882E-01 0.663E-01 0.04 1.0 T
247 -96.4911151 -0.547175E-01 0.384E-01 1.73 1.0 T
248 -96.4972676 -0.615250E-02 0.205E-01 0.61 1.0 T
249 -96.5001448 -0.287719E-02 0.985E-02 0.21 1.0 T
250 -96.4243660 0.757788E-01 0.721E-01 0.04 1.0 T
*** convergence criteria cannot be satisfied within 250 iterations ***
# Occupation Energy/Eh Energy/eV
-------------------------------------------------------------
1 2.0000 -0.8070918 -21.9621
... ... ... ...
78 2.0000 -0.4511214 -12.2756
79 2.0000 -0.4500486 -12.2464
80 2.0000 -0.4448855 -12.1059
81 2.0000 -0.4372995 -11.8995
82 2.0000 -0.4308839 -11.7249
83 2.0000 -0.3971413 -10.8068
84 1.3381 -0.3761309 -10.2350 (HOMO)
85 0.6619 -0.3747934 -10.1986 (LUMO)
86 -0.3591114 -9.7719
87 -0.3027914 -8.2394
88 -0.2896251 -7.8811
89 -0.2210509 -6.0151
... ... ...
153 0.6289752 17.1153
-------------------------------------------------------------
HL-Gap 0.0013375 Eh 0.0364 eV
Fermi-level -0.3754621 Eh -10.2168 eV
SCC (total) 0 d, 0 h, 0 min, 1.483 sec
SCC setup ... 0 min, 0.003 sec ( 0.227%)
Dispersion ... 0 min, 0.002 sec ( 0.108%)
classical contributions ... 0 min, 0.000 sec ( 0.019%)
integral evaluation ... 0 min, 0.016 sec ( 1.054%)
iterations ... 0 min, 1.411 sec ( 95.115%)
molecular gradient ... 0 min, 0.051 sec ( 3.441%)
printout ... 0 min, 0.000 sec ( 0.034%)
########################################################################
[ERROR] Program stopped due to fatal error
-3- Single point calculation terminated
-2- xtb_calculator_singlepoint: Electronic structure method terminated
-1- scf: Self consistent charge iterator did not converge
########################################################################
[file orca_main/run.cpp, line 12281]: ORCA finished with error return - aborting the run
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