[CPMD-list] (no subject)
bala at jncasr.ac.in
bala at jncasr.ac.in
Wed Oct 10 18:17:31 CET 2007
Dear K.Dong,
A CPMD time step of 10 a.u. with EMASS=600 appears to be on the high
side. I would suggest to stick with 5 a.u. (which could be a
conservative value, but is safe).
Have you deuterated the hydrogens? That could be useful too.
Also, did you copy (cut+paste) the input file in your mail, or did you
type it in? (I noticed a typo in the "MOLECULAR DYNAMICS" line).
Best,
Bala
> Dear every cpmd user,
> I am studying a mixture of water and aother solvant.
> After 5ns using classical MD, I pick up a
> configuration as initial geometry to carry
> out the CPMD.
> After optimization of wavefunctions, the molecular dynamic was
> carried out, my input file look like as follows,
> &CPMD
> MOLECULAR DYNAIMCS CP
> RESTART WAVEFUNCTIONS COORDINATES LATEST
> MAXSTEP
> 10000
> TIMESTEP
> 5.0
> EMASS
> 600
> NOSE IONS
> 350.0 3000.0
> &END
> ........
>
>
> My system contains 624 atoms, the DFT is BLYP.
> but the output file look like as follows,
> TOTAL INTEGRATED ELECTRONIC DENSITY
> IN G-SPACE
> =
> 1296.000000
> IN R-SPACE
> =
> 1296.000000
>
> (K+E1+L+N+X)
> TOTAL ENERGY =
> 1060.70424073 A.U.
> (K)
> KINETIC ENERGY =
> 1152.16714712 A.U.
> (E1=A-S+R) ELECTROSTATIC ENERGY
> = 623.45349978 A.U.
> (S)
> ESELF = 1633.00373444 A.U.
> (R)
> ESR = 104.08282525
> A.U.
> (L) LOCAL PSEUDOPOTENTIAL ENERGY
> = -246.43453910 A.U.
> (N) N-L PSEUDOPOTENTIAL ENERGY
> = 71.85023843
> A.U.
> (X) EXCHANGE-CORRELATION ENERGY
> = -540.33210550 A.U.
> GRADIENT CORRECTION
> ENERGY =
> -27.19522460 A.U.
>
> NFI
> EKINC
> TEMPP
> EKS
> ECLASSIC
> EHAM DIS
> TCPU
> 1405.82400
> 2304.5 1060.70424
> 1066.65044 1472.47444 0.267E-04
> 49.31
> 2*********
> 7683.0 362.41271
> 382.25520 1442.24111 0.378E-03
> 49.88
> 3*********
> 14286.4 -161.05320
> -123.98183 1426.36893 0.175E-02
> 49.81
> 4*********
> 19178.7 -479.07083
> -428.70524 1421.92633 0.480E-02
> 50.82
> 5*********
> 21004.5 -615.53653
> -559.18291 1423.61595 0.964E-02
> 50.08
> 6*********
> 20588.9 -639.97824
> -583.17403 1430.63220 0.158E-01
> 50.54
> 7*********
> 19201.5 -640.22750
> -585.70370 1433.66427 0.224E-01
> 50.18
> 8*********
> 17441.1 -638.63291
> -587.47348 1433.66556 0.289E-01
> 50.27
> 9*********
> 15586.6 -621.54404
> -574.06576 1436.47016 0.349E-01
> 50.37
> 10*********
> 13990.8 -597.68101
> -553.27424 1438.53594 0.403E-01
> 49.54
> 11*********
> 12777.0 -578.07436
> -535.81504 1440.02596 0.452E-01
> 49.83
> 12*********
> 11812.7 -571.61753
> -530.92881 1440.10169 0.498E-01
> 50.14
> 13*********
> 10988.3 -577.18200
> -537.76902 1438.61381 0.540E-01
> 50.15
> 14*********
> 10240.8 -582.77211
> -544.49911 1438.13870 0.579E-01
> 50.56
> 15*********
> 9584.7 -583.12336
> -545.81173 1438.55877 0.613E-01
> 49.97
> 16*********
> 9040.3 -581.73781
> -545.14929 1439.51770 0.643E-01
> 50.37
> Originally, I think the timestep is not correct, but when the
> timestep is increased to 10.0, the NaN ocurred, so I did not know the
> reasons,
> can you help me?
>
>
> Best Regards
> k.dong
>
> 2007-08-28
>
>
>
> K. dong
> Institute of Process Engineering
> Chinese Academy of Sciences
> P. O. BOX 63, Beijing 100080
> The People's Republic of China
> E-mail: dongkun at home.ipe.ac.cn
> kdong at foxmail.com
>
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