--- trunk/src/primitives/DirectionalAtom.cpp	2008/01/23 16:38:22	1211
+++ trunk/src/primitives/DirectionalAtom.cpp	2009/09/07 16:31:51	1360
@@ -134,9 +134,9 @@ namespace oopse {
     ephi[1] = 0.0;
     ephi[2] = 1.0;
     
-    etheta[0] = cphi;
-    etheta[1] = sphi;
-    etheta[2] = 0.0;
+    etheta[0] = -sphi;
+    etheta[1] =  cphi;
+    etheta[2] =  0.0;
     
     epsi[0] = stheta * cphi;
     epsi[1] = stheta * sphi;