qcx#h0_old#he2.dat

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 DATA REFORMATTED TO NEW ADF01 FORMAT.

 INPUT DATA FILE : JETSHP.CHEXDATA.DATA(HE2NEW1)
 SUB-BLOCK USED  : 4
 SUB-BLOCK TITLE :  PREFERRED DATA HE(2+); ENERGY:1_800 KEV/AMU (FRITSCH/BELKIC/HOEKSTRA)

 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 = 4
      ----------
      ENERGY    = 1 _ 800 KEV/AMU
      N         = 1 _ 6
      APPROX    = BEST CHOICE FROM SEVERAL SOURCES (THEORY/EXPERIMENT)
      REFERENCE = FRITSCH/BELKIC/HOEKSTRA(FOM)

      REMARKS:
      THE DATASET IS OBTAINED BY MANUALLY FITTING CURVES THROUGH
      N - SHELL FRACTIONAL CROSS-SECTION DATA INFLUENCED MOSTLY BY
      FRITSCH , BELKIC AND HOEKSTRA.  THERE IS A
      SMOOTH TRANSITION IN THE REGION 50 < E(KEV/AMU) < 200 THAT
      TENDS TO FRITSCH'S DATA IN THE LOWER ENERGY REGION, AND
      APPROXIMATES BELKIC'S DATA AT THE HIGHER ENERGIES.
      ALSO THE EXPERIMENTAL DATA OF HOEKSTRA ARE TAKEN INTO ACCOUNT
      WHICH CONCERNS THE CAPTURE CROSS SECTIONS INTO N = 4 IN THE
      ENERGY REGION 2.5 < E(KEV/AMU) < 13.0 .

      FRITSCH, BELKIC, HOEKSTRA, RYUFUKU AND OLSON DATA WERE ALL
      ANALYSED USING NEUTBEAM.FORT(CXERROR) CODE.  PLOTS OF ALPHA
      AND ITS APPARENT UNCERTAINTIES WERE PREPARED AND A PREFERRED
      ALPHA CURVE DRAWN MANUALLY. THIS ANALYSIS WAS ALSO USED TO
      DEDUCE A PREFERRED N=6 X-SECT.  THE PREFERRED N-SHELL FRACTIONS
      WERE RENORMALISED USING ALPHA ONWARD FROM THE N=6 SHELL AND
      CONVERTED TO ABSOLUTE CROSS-SECTIONS USING THE PREFERRED TOTAL.


      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