Debye-Hückel Type Excluded-Volume Parameters

	ev-dh : list in the following form;
	(define ev-dh '(
	  ; system parameters
	  1.0e-6   ; 1) epsilon for the cut-off distance of EV_DH interaction
	  298.0    ; 2) temperature [K]
	  80.0     ; 3) dielectric constant of the solution
	  3.07     ; 4) Debye length [nm]
	  (        ; 5) list of DH types
	   (; DH type 1
	    2.43    ; 1) nu [e/nm]
	    5.00    ; 2) l0 [nm]
	    (0 1 2) ; 3) list of particles
	   )
	   (; DH type 2
	    2.00    ; 1) nu [e/nm]
	    4.00    ; 2) l0 [nm]
	    (3 4)   ; 3) list of particles
	   )
	  )
	))