--- trunk/OOPSE/libmdtools/calc_LJ_FF.F90	2003/04/04 22:22:30	460
+++ trunk/OOPSE/libmdtools/calc_LJ_FF.F90	2003/04/08 22:38:43	482
@@ -2,7 +2,7 @@
 !! Corresponds to the force field defined in lj_FF.cpp 
 !! @author Charles F. Vardeman II
 !! @author Matthew Meineke
-!! @version $Id: calc_LJ_FF.F90,v 1.2 2003-04-04 22:22:30 chuckv Exp $, $Date: 2003-04-04 22:22:30 $, $Name: not supported by cvs2svn $, $Revision: 1.2 $
+!! @version $Id: calc_LJ_FF.F90,v 1.3 2003-04-08 22:38:43 chuckv Exp $, $Date: 2003-04-08 22:38:43 $, $Name: not supported by cvs2svn $, $Revision: 1.3 $
 
 module lj
   use definitions
@@ -219,9 +219,9 @@ contains
        
        dudr = 24.0E0_DP * epsilon * (t6 - 2.0E0_DP*t12) / rij
        
-       drdx = -d(1) / rij
-       drdy = -d(2) / rij
-       drdz = -d(3) / rij
+       drdx = d(1) / rij
+       drdy = d(2) / rij
+       drdz = d(3) / rij
        
        fx = dudr * drdx
        fy = dudr * drdy