qcx#h0_ofr#he2.dat

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 DATA REFORMATTED TO NEW ADF01 FORMAT.

 INPUT DATA FILE : JETSHP.CHEXDATA.DATA(HE2NEW1)
 SUB-BLOCK USED  : 3
 SUB-BLOCK TITLE :  CCAO     FRITSCH  1.00KEV/AMU - 150.00 KEV/AMU   HE+2

 COMMENT RECORDS FROM INPUT DATA FILE ARE APPENDED BELOW.

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                       H(1S) + HE(2+) --> H(+) + HE(+)
                       --------------------------------

      INFORMATION                              #1989 RESTRUCTURED DATA
      -----------
      THE FOLLOWING OPTIONS ARE AVAILABLE SELECTED BY IBLOCK

      IBLOCK = 3
      ---------
      ENERGY    = 1.0 - 150.0 KEV/AMU.
      N         = 1 _ 6.
      APPROX    = CCAO.
      REFERENCE = W. FRITSCH.
                  PRIVATE COMMUNICATION (1986 - 1989).

      REMARKS:
      THIS DATASET IS OBTAINED BY TRANSFORMING FRITSCH'S THEORETICAL
      RESULTS, USING SEVERAL STEPS.
      FIRSTLY A DATASET IS CONSTRUCTED CONTAINING NORMALISED VALUES
      SIGMA(N)/SIGMA(TOTAL) AS DERIVED FROM THE THEORY. THE ASSUMPTION
      IS MADE THAT THESE QUOTIENTS ARE GOOD APPROXIMATIONS OF THE
      TRUE VALUES.
      HOWEVER FRITSCH'S DATA ARE NOT PROVIDED WITH RESULTS OF THE TOTAL
      CROSS SECTIONS BUT ONLY WITH N,L,J - DATA UP TO N = 6. IN ORDER
      TO GET A GOOD ESTIMATE OF THE TOTAL CROSS SECTIONS, THE DATASET
      SIGMA(N) IS EXTRAPOLETED FOR N > 6, USING THE FACT THAT SIGMA(N)
      SCALES WITH N**(-ALPHA), WHEN N > N(SIGMA MAX) = N(CRITICAL).
      THE VALUE ALPHA IS APPROXIMATED BY
      ALPHA = LOG( SIGMA(N=5)/SIGMA(N=6) ) / LOG(6/5) .
      THE DATASET IS EXTRAPOLATED TO N=10 AND THE SUMMATION OF
      SIGMA(N=1) TO SIGMA(N=10) GIVES THE ESTIMATE OF THE TOTAL CROSS
      SECTION.
      THE FINAL DATASET OF SIGMA(N) AS IT IS TABULATED IN THIS FILE
      IS OBTAINED BY MULTIPLYING THE NORMALISED CROSS SECTIONS WITH
      A PREFERRED DATASET OF TOTAL CX-CROSS SECTIONS.

      LFORMA ,XLCUTA, PL2A AND PL3A ARE DERIVED BY FITTING SIGMA(N,L)
      USING THE A-D-A-S ENTRY PROGRAMME FOR CHARGE EXCHANGE DATA
      FOR PRINCIPAL QUANTUM SHELL N=4 AT ALL TABULATED ENERGIES


                        J. FRIELING & H.P. SUMMERS   2 JAN 1990
=======================================================================
   L-SPLITTING IS RECONSTITUTED FROM THE JET N-SHELL RESOLUTION DATA 
   BLOCK USING  ITS L-SHELL FORM PARAMETERS.  THE DATA SET THUS EXACTLY
   MATCHES THE JET DATA SET IN APPLICATION.  NOTE THE L-SHELL FORM
   PARAMETERS ARE OPTIMIMISED AROUND THE N-SHELLS RESPONSIBLE FOR 
   VISIBLE LINE CHARGE EXCHANGE SPECTROSCOPY EMISSION.

                                             H.P. SUMMERS  28 JULY 1995
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Contributors

• Hugh Summers