ADAS Subroutine r8rd2f

       FUNCTION R8RD2F( N , L , L1 , E2 )
C
C
C-----------------------------------------------------------------------
C
C  **************** FORTRAN77 REAL*8 FUNCTION: R8RD2F ******************
C
C  PURPOSE: CLACULATES HYDROGENIC BOUND-FREE RADIAL INTEGRALS USING
C           RECURRENCE RELATIONS.
C
C  CALLING PROGRAM: GENERAL USE
C
C  FUNC:   (R*8)  R8RD2F  = RESULT OF INTEGRAL.
C
C  INPUT:  (I*4)  N       = PRINCIAPL QUANTUM NUMBER OF BOUND ELECTRON.
C  INPUT:  (I*4)  L       = ORBITAL QUANTUM NUMBER OF BOUND ELECTRON.
C  INPUT:  (I*4)  L1      = ORBITAL QUANTUM NUMBER OF FREE ELECTRON.
C  INPUT:  (R*8)  E2      =
C
C  PARAM:  (R*8)  P1      = EQUATION CONSTANT = 64.
C  PARAM:  (R*8)  P12     = EQUATION CONSTANT = P1**2.
C  PARAM:  (R*8)  P2      = EQUATION CONSTANT = 1/P1.
C  PARAM:  (R*8)  P22     = EQUATION CONSTANT = P2**2.
C
C          (I*4)  JS      =
C          (I*4)  I       = LOOP INDEX.
C
C          (R*8)  XN      = REAL VALUE = N.
C          (R*8)  XN1     = REAL VALUE = N-1.
C          (R*8)  XN2     = REAL VALUE = XN**2.
C          (R*8)  E       =
C          (R*8)  U       =
C          (R*8)  V       =
C          (R*8)  P       =
C          (R*8)  XI      = REAL VALUE = I.
C          (R*8)  XI1     = REAL VALUE = I+1.
C          (R*8)  XI12    = REAL VALUE = XI1**2.
C          (R*8)  T1      =
C          (R*8)  T2      =
C          (R*8)  T3      =
C
C ROUTINES: NONE
C
C AUTHOR:   JONATHAN NASH (TESSELLA SUPPORT SERVICES PLC)
C           K1/0/81
C           JET EXT. 5183
C
C DATE:     04/11/93
C
C UNIX-IDL PORT:
C
C AUTHOR:  WILLIAM OSBORN (TESSELLA SUPPORT SERVICES PLC)
C
C DATE:    22ND MAY 1996
C
C VERSION: 1.1                          DATE: 22-05-96
C MODIFIED: WILLIAM OSBORN
C               - FIRST VERSION. IBM VERSION NOT CHANGED
C
C-----------------------------------------------------------------------
C
C-----------------------------------------------------------------------
      INTEGER             L,           L1,          N
      REAL*8              E2