Hello Bipul,
I was having same problem some time ago.  It was due to that, i was putting 
atoms  at the both initial and final position of lattice constant i.e if my 
lattice constent is 4.26 in z direction then i was puting atoms along z 
direction at initial point i.e. at 0 and final position i.e. 4.26 . And when 
siesta was generating supercell in z direction it repeate cell in terms of unit 
cell i.e. lattice vector. So initial point for next cell was at  4.26 along z 
direction  where i have already  placed atom  . So siesta get two atoms at the 
same position and printing warning like mensioned by u. 
It u have given the same input as me then u can just remove the atoms from the 
final positions of lattice constents.  
Good luck. 

Vikas Thakur.
 
bipul rakshit <[EMAIL PROTECTED]> wrote: hello siesta user, 
  when some time doing MD or Vibra, these type of messages comes.......
  what is the reason behind that...........and how correct it??
   
  siesta: WARNING: Atoms   235   243 too close: rij =    0.000000 Ang
siesta: WARNING: Atoms   236   244 too close: rij =    0.000000 Ang
siesta: WARNING: Atoms   237   241 too close: rij =    0.000000 Ang
siesta: WARNING: Atoms   238   248 too close: rij =    0.000000 Ang
siesta: WARNING: Atoms   239   249 too close: rij =    0.000000 Ang
siesta: WARNING: Atoms   240   250 too close: rij =    0.000000 Ang
siesta: WARNING: Atoms   241   249 too close: rij =    0.000000 Ang
siesta: WARNING: Atoms    242   244 too close: rij =    0.000000 Ang
siesta: WARNING: Atoms   243   245 too close: rij =    0.000000 Ang
siesta: WARNING: Atoms   244   246 too close: rij =    0.000000 Ang
siesta: WARNING: Atoms   245   249 too close: rij =    0.000000 Ang
siesta: WARNING: Atoms   246   248 too close: rij =    0.000000 Ang
siesta: WARNING: Atoms   247   249 too close: rij =    0.000000 Ang
siesta: WARNING: Atoms   248   250 too close: rij =    0.000000 Ang

          

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