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diff --git a/potentials/lennard_jones.h b/potentials/lennard_jones.h
new file mode 100644
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+++ b/potentials/lennard_jones.h
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+/*
+ * lennard_jones.h - lennard jones potential header file
+ *
+ * author: Frank Zirkelbach <frank.zirkelbach@physik.uni-augsburg.de>
+ *
+ */
+
+#ifndef LENNARD_JONES_H
+#define LENNARD_JONES_H
+
+/* types */
+typedef struct s_lj_params {
+	double sigma6;
+	double sigma12;
+	double epsilon4;
+	double uc;
+} t_lj_params;
+
+/* function prototype */
+int lennard_jones(t_moldyn *moldyn,t_atom *ai,t_atom *aj,u8 bc);
+
+#endif