public void addForceFieldToConnection(ForceField forceField) {
		if (forceField == null)
			throw new IllegalArgumentException("The given forcefield for the forcefieldconnection can't be null!");
		if (this.forceFields.contains(forceField))
			throw new IllegalArgumentException("The given forcefield is already added in this forceFieldConnection");
		this.forceFields.add(forceField);
	}