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ADAS Subroutine cxsgei

      SUBROUTINE CXSGEI( MXNSHL , IZ1    , ZT     , ZT1    , THETA  ,
     &                   VEL    , NA     , LA     , NB     ,
     &                   XSECNA , FRACLA
     &                 )
C
C
C-----------------------------------------------------------------------
C
C  ****************** FORTRAN77 SUBROUTINE: CXSGEI *********************
C
C  PURPOSE:  USES THE EIKONAL APPROXIMATION TO CALCULATE CHARGE EXCHANGE
C            CROSS-SECTIONS INTO N'L' RESOLVED EXCITED STATES OF
C            HYDROGENIC IONS IN CAPTURE FROM HYDROGEN NL STATES.
C
C            THE SUBROUTINE CAN BE USED FOR CAPTURE FROM HELIUM BY
C            APPROPRIATE CHOICE OF ZT AND ZT1.
C
C            FOR HYDROGEN, ZT = ZT1 = 1.0
C            FOR HELIUM  , ZT = ZT1 = 1.6875
C
C            EICHLER (1981) PHYS.REV.A,23,498.
C
C  CALLING PROGRAM: ADAS308.
C
C  INPUT : (I*4)  MXNSHL   = MAXIMUM VALUE OF N QUANTUM NUMBER.
C  INPUT : (I*4)  IZ1      = HYDROGENIC ION CHARGE (PROJECTILE).
C  INPUT : (R*8)  ZT       = SCREENING CHARGE FOR THE 1S ELECTRON OF THE
C                            TARGET ATOM IN THE INITIAL STATE.
C  INPUT : (R*8)  ZT1      = EFFECTIVE CHARGE FOR THE 1S ELECTRON OF THE
C                            TARGET ATOM IN THE FINAL STATE.
C  INPUT : (R*8)  THETA    = PARAMETER TO GIVE CORRECT BINDING ENERGY
C                            FOR INITIAL TARGET STATE.
C  INPUT : (R*8)  VEL      = COLLISION SPEED.
C                            UNITS: AT. UNITS
C  INPUT : (I*4)  NA       = PRINCIPAL QUANTUM NUMBER OF INTIAL STATE OF
C                            TARGET FROM WHICH CAPTURE IS MADE.
C  INPUT : (I*4)  LA       = ORBITAL QUANTUM NUMBER OF INTIAL STATE OF
C                            TARGET FROM WHICH CAPTURE IS MADE.
C  INPUT : (I*4)  NB       = PRINCIPAL QUANTUM NUMBER OF FINAL STATES OF
C                            PROJECTILE TO WHICH CAPTURE IS MADE.
C
C  OUTPUT: (R*8)  XSECNA   = N-RESOLVED CROSS-SECTION FOR CAPTURE.
C                            UNITS: AT. UNITS
C  OUTPUT: (R*8)  FRACLA() = L-RESOLVED CROSS-SECTION AS A FRACTION OF
C                            CORRESPONDING N-RESOLVED CROSS-SECTION.
C                            DIMENSION: REFERENCED BY L QUANTUM NUMBER.
C
C  PARAM : (I*4)  MXN      = 'MXNSHL'.
C  PARAM : (R*8)  PI       = PI.
C
C          (I*4)  LB       = ORBITAL QUANTUM NUMBER OF FINAL STATE OF
C                            PROJECTILE.
C          (I*4)  I        = LOOP INDEX.
C          (I*4)  K        = LOOP INDEX.
C          (I*4)  IU       = LOOP INDEX.
C          (I*4)  MB       = LOOP INDEX.
C          (I*4)  MB1      = LOOP INDEX.
C          (I*4)  IND      =
C          (I*4)  IL       = LOOP INDEX.
C          (I*4)  IG       = LOOP INDEX.
C          (I*4)  IWM      = LOOP INDEX.
C          (I*4)  IW1      = LOOP INDEX.
C          (I*4)  IW2      = LOOP INDEX.
C          (I*4)  IW3      = LOOP INDEX.
C          (I*4)  IW4      = LOOP INDEX.
C          (I*4)  IBA      = LOOP INDEX.
C          (I*4)  IVA      = LOOP INDEX.
C          (I*4)  ITA      = LOOP INDEX.
C          (I*4)  IAM      =
C          (I*4)  IA1      = LOOP INDEX.
C          (I*4)  IA2      = LOOP INDEX.
C          (I*4)  IA3      =
C          (I*4)  ISA      =
C          (I*4)  IBB      = LOOP INDEX.
C          (I*4)  IVB      = LOOP INDEX.
C          (I*4)  ITB      = LOOP INDEX.
C          (I*4)  IAM      =
C          (I*4)  IB1      = LOOP INDEX.
C          (I*4)  IB2      = LOOP INDEX.
C          (I*4)  IB3      =
C          (I*4)  ISB      =
C          (I*4)  IP       = LOOP INDEX.
C
C          (R*8)  Z1       = REAL VALUE = IZ1.
C          (R*8)  XNA      = REAL VALUE = N.
C          (R*8)  XNB      = REAL VALUE = N.
C          (R*8)  ETA      =
C          (R*8)  EPS      =
C          (R*8)  PM       =
C          (R*8)  PP       =
C          (R*8)  QNA      =
C          (R*8)  QNB      =
C          (R*8)  QP       =
C          (R*8)  ZT12     = ZT12**2.
C          (R*8)  T1       =
C          (R*8)  T2       =
C          (R*8)  T3       =
C          (R*8)  T4       =
C          (R*8)  T5       =
C          (R*8)  T6       =
C          (R*8)  T7       =
C          (R*8)  T8       =
C          (R*8)  SUM      =
C          (R*8)  SUM1     =
C          (R*8)  BB       =
C          (R*8)  BB1      =
C
C          (Z*16) CTA      =
C          (Z*16) CTB      =
C          (Z*16) CT1      =
C          (Z*16) CSUM     =
C
C          (R*8)  B()      =
C          (R*8)  F()      =
C
C ROUTINES:
C          ROUTINE    SOURCE    BRIEF DESCRIPTION
C          -------------------------------------------------------------
C          I4UNIT     ADAS      RETURNS UNIT NO. FOR OUTPUT OF MESSAGES.
C          I4JGAM     ADAS      RETURNS VALUE FROM 'JGAM' TABLE.
C          R8GAM      ADAS      RETURNS VALUE FROM 'GAM' TABLE.
C          Z16CD      ADAS
C
C AUTHOR:  JONATHAN NASH (TESSELLA SUPPORT SERVICES PLC)
C          K1/0/81
C          JET EXT. 5183
C
C DATE:    06/10/93
C
C-----------------------------------------------------------------------
C
C-----------------------------------------------------------------------
      INTEGER             IZ1,         LA,          MXNSHL,      NA
      INTEGER             NB
      REAL*8              FRACLA(MXNSHL),           THETA,       VEL
      REAL*8              XSECNA,      ZT,          ZT1
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