subroutine surface(v,rij)
      USE PES_Module
      implicit none
      character(LEN=25) potname
	real*8 v, rij
	dimension rij(3)
      external lifhb
!-----------------------------------------------------------------------
!  The character string potname must contain a string that uniquely
!  specifies the potential energy surface to be used.
!-----------------------------------------------------------------------
      data potname/'LiFH_B BondOrder PES'/

!-----------------------------------------------------------------------
! Check for correct potential energy surface specification.
!-----------------------------------------------------------------------
      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'
         write(6,304)' Name read in from input data:  ',pes_name
         write(6,304)' Name of the potential energy surface routine:  ',
     >              potname
  304    format(1x,a20)
         stop 'surface'
      end if

!-----------------------------------------------------------------------
! This call to surfac supplies the potential energy surface
! for the particular system of interest.
!-----------------------------------------------------------------------
      call lifhb(v,rij)
      return
      end