*dk surface
      subroutine surface(v,rij)
c
c   $RCSfile: surface.f,v $ $Revision: 1.4 $
c   $Date: 89/08/04 14:22:14 $
c   $State: Stable $
c
c-----------------------------------------------------------------------
c This routine supplies the potential energy surface for the
c reactive scattering codes.
c
c On entering: The array rij contains the internuclear distances
c              in units of bohr (NOT mass scaled).
c
c              The common /pes/ must contain a character string
c              of length 20 that properly describes the potential.
c
c On Exit:     The variable v is the value of the potential energy
c              surface in Hartree atomic units.
c
c
c-----------------------------------------------------------------------
      USE pes_MODULE
      implicit real*8 (a-h,o-z)
      dimension rij(3)
      character*20 potname

c pesname  A unique name for the potential energy surface being used.
c-----------------------------------------------------------------------

!      character*25 pesname
!      common /pes/ pesname


c-----------------------------------------------------------------------
c  The character string potname must contain a string that uniquely
c  specifies the potential energy surface to be used.
c-----------------------------------------------------------------------
      data potname/'LI3 INTER PES'/

c-----------------------------------------------------------------------
c Check for correct potential energy surface specification.
c-----------------------------------------------------------------------
      if(pes_name.ne.potname)then
      write(6,*)'The potential energy surface name does not match',
     >          ' the name in the potential energy surface routine.'
      write(6,*)'***error***: Execution stopped in routine surface'
      print *,'pes_name=',pes_name,'potname=',potname
      stop 'potname'
      end if
c-----------------------------------------------------------------------
c This call to surfac supplies the potential energy surface
c for the particular system of interest.
c-----------------------------------------------------------------------
      call vli3(rij,v)
      return
      end