[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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