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c     ###################################################
c     ##  COPYRIGHT (C)  1992  by  Jay William Ponder  ##
c     ##              All Rights Reserved              ##
c     ###################################################
c
c     ################################################################
c     ##                                                            ##
c     ##  vdwpot.i  --  specifics of van der Waals functional form  ##
c     ##                                                            ##
c     ################################################################
c
c
c     abuck      value of "A" constant in Buckingham vdw potential
c     bbuck      value of "B" constant in Buckingham vdw potential
c     cbuck      value of "C" constant in Buckingham vdw potential
c     ghal       value of "gamma" in buffered 14-7 vdw potential
c     dhal       value of "delta" in buffered 14-7 vdw potential
c     v2scale    factor by which 1-2 vdw interactions are scaled
c     v3scale    factor by which 1-3 vdw interactions are scaled
c     v4scale    factor by which 1-4 vdw interactions are scaled
c     v5scale    factor by which 1-5 vdw interactions are scaled
c     igauss     coefficients of Gaussian fit to vdw potential
c     ngauss     number of Gaussians used in fit to vdw potential
c     vdwtyp     type of van der Waals potential energy function
c     radtyp     type of parameter (sigma or R-min) for atomic size
c     radsiz     atomic size provided as radius or diameter
c     radrule    combining rule for atomic size parameters
c     epsrule    combining rule for vdw well depth parameters
c     gausstyp   type of Gaussian fit to van der Waals potential
c
c
      integer maxgauss
      parameter (maxgauss=10)
      integer ngauss
      real*8 abuck,bbuck,cbuck
      real*8 ghal,dhal
      real*8 v2scale,v3scale
      real*8 v4scale,v5scale
      real*8 igauss
      character*5 radtyp
      character*8 radsiz,gausstyp
      character*10 radrule,epsrule
      character*13 vdwtyp
      common /vdwpot/ abuck,bbuck,cbuck,ghal,dhal,v2scale,v3scale,
     &                v4scale,v5scale,igauss(2,maxgauss),ngauss,vdwtyp,
     &                radtyp,radsiz,radrule,epsrule,gausstyp
