[CPMD-list] About temperature and pressure

Ô­Åô·É pfyuan at ustc.edu
Wed Nov 16 03:07:20 CET 2005


Dear all,
        I have run a parrinello-rahman NPT calculation in the HPUX_IA64 machine , the final result of the temperature and the pressure are convergenced to the give one. But the vibration of the two parameters are very big , for temperature it is about 26K and for pressure about 35kbar. Do someone know how to decrease the vibrations. I want the vibration can be lessen than 1K and 1kbar.
        Thank you very much.
                                                                                                                      Yuan Pengfei
the inpur file is list here:
&CPMD  MOLECULAR DYNAMICS CP  RESTART WAVEFUNCTION COORDINATES  TIMESTEP   0.5  MAXSTEP  40000   SPLINE RANGE   3.0  NOSE CELL    30.0D0   120000  NOSE IONS   300.0D0   1500  PARRINELLO-RAHMAN NPT   STRUCTURE BONDS  STRUCTURE ANGLES  &END
&DFT  FUNCTIONAL BLYP&END
&SYSTEM ANGSTROM  PRESSURE  100.0SYMMETRY14CELL 7.037   1.0    1.5583    0.0   0.0   -0.5 CUTOFF80.0&END
&ATOMS*C_MT_BLYP_1.psp    KLEINMAN-BYLANDER  LMAX=P 121.954747   -0.359930    2.170488        2.890668    0.627950    2.817350    -1.507792    1.702786    0.881039   -1.301370    2.223288    2.297061       -2.149606   -2.205727   -0.785117      -1.797468   -2.127230    0.681563      1.954747   -0.359930    7.653488        2.890668    0.627950    8.300350     -1.507792    1.702786    6.364039      -1.301370    2.223288    7.780061     -2.149606   -2.205727    4.697883     -1.797468   -2.127230    6.164563
*O_SPRIK_BLYP.psp    KLEINMAN-BYLANDER LMAX=P  12  0.947259   -0.723091    2.812488    2.199202   -0.773115    1.017326   -0.650672    0.913879    0.431077   -2.529066    2.045850    0.235963   -2.056298   -1.158235   -1.457910   -2.439865   -3.326691   -1.248190    0.947259   -0.723091    8.295488    2.199202   -0.773115    6.500326   -0.650672    0.913879    5.914077   -2.529066    2.045850    5.718963   -2.056298   -1.158235    4.025090   -2.439865   -3.326691    4.234810
*N_MT_BLYP.psp    KLEINMAN-BYLANDERLMAX=P6     2.685116    0.720450    4.269928      -0.873421    1.138715    3.195304     -0.390811   -1.769375    0.728740     2.685116    0.720450    9.752928     -0.873421    1.138715    8.678304     -0.390811   -1.769375    6.211740
*H_MT_BLYP.psp    KLEINMAN-BYLANDERLMAX=S30 3.476329    1.135486    4.768900    1.890056    1.354134    4.395797    2.468625   -0.171189    4.707649    2.756603    1.609063    2.371401    3.878756    0.287630    2.566958   -0.541399    1.516423    4.082387   -1.559845    0.420835    3.424845   -0.109696    0.602641    2.786094   -2.200211    2.697251    2.687188   -0.531017    2.989539    2.268505   -0.031957   -1.535664    1.655901    0.195362   -2.499005    0.322463   -0.307369   -0.906107    0.193699   -1.981258   -3.073606    1.183995   -2.383603   -1.356955    1.172659    3.476329    1.135486   10.251900    1.890056    1.354134    9.878797    2.468625   -0.171189   10.190649    2.756603    1.609063    7.854401    3.878756    0.287630    8.049958   -0.541399    1.516423    9.565387   -1.559845    0.420835    8.907845    -0.109696    0.602641    8.269094   -2.200211    2.697251    8.170188   -0.531017    2.989539    7.751505   -0.031957   -1.535664    7.138901    0.195362   -2.499005    5.805463   -0.307369   -0.906107    5.676699   -1.981258   -3.073606    6.666995   -2.383603   -1.356955    6.655659&END  
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