helike_kvih97he.dat

• Spontaneous Emission: He⁺⁰(i) → He⁺⁰(j) + hv
• Electron Impact Excitation: He⁺⁰(i) + e → He⁺⁰(j) + e

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  A-values are taken from Wiese, Smith & Glennon  NBS-NSRDS

  Dipole & non-dipole transitions from the 1(1)S follow
     (i)   preferred curves from comparative graphs up to the n=4 shell
           strongly influenced by experiments of
           Westerfeld  (1979) J. Phys. B. 12,115
           Van Zyl et al.(1980) Phys. Rev. A22, 1916
           Heddle & Gallagher (1989) Rev.Mod.Phys. 61, 221,
           Born limits and to a lesser extent by
           Fujimoto (1978) IPPJ-AM-9
           and at low temperature
           unpublished 29 state R-matrix calculations of Berrington et
           al. (1990)

  Dipole & non-dipole transitions from the 2(1)S & 2(3)S states follow
     (i)   Fujimoto (1978) IPPJ-AM-8. Non-dipole Born limits from
           Flannery, Morrision & Richmond (1975) J.Appl.Phys. 46, 1186

  Dipole transitions within the n=3,4 shells
     (i)   Impact parameter approximation


  Spin change data follow
     (i)   Kato (1989) At. Data & Nucl. Data Tables 42,313  for
           transitions 1(1)S - 2(3)S and 1(1)S - 2(3)P
     (ii)  Berrington et al. (1985) J. Phys. B. 18, 4147 for
           transitions 2(3)S - 2(1)S,  2(3)S - 2(1)P,
           2(1)S - 2(3)P & 2(3)P - 2(1)P at low temperature and
           follows a similar decay to high temperature as the Kato data
     (iii) For 1(1)S - 3(3)L , the data of Berrington et al.
           is used for low temperature and then the shape of the
           Kato curves above 5eV scaled to match Berrington at 5eV.
     (iv)  For 1(1)S - 4(3)L , 1/n**3 scaling is used from the n=3
           data.


                                                H.P. Summers, Mar. 1991



  Update:

  Dipole transitions between 2(1)P - n=3,4 and 2(3)P - n=3,4 added.
      (i)  Impact parameter approximation


                                                H.P. Summers, Jan. 1992
  Update:

  A complete revision of excitations from 1(1)S and 2(3)S, 2(1)S has
  taken place in association with FOM-KVI (R. Hoekstra, F de Heer,
  H-F Folkerts) making use also of recent Belfast R-matrix data.  The
  new data has replace the older data above where there is ovelap.
  The new preferred cross-section data is archived as
             JETSHP.KVI.DATA(EXC#HE0A) - excitation from 1(1)S
             JETSHP.KVI.DATA(EXC#HE0B) - excitation from 2(1)S, 2(3)S
  The rate parameters are produced in ADF04 format by the codes
             JETSHP.COPASE.FORT(NEUTQUAD)  and
             JETSHP.COPASE.FORT(NEUTQD2)   respectively.


                                                H.P. Summers, June 1993


  Update:

  Attention has been drawn to errors in some A-values in the dataset by
  Mathias Brix.   The corrections are as follow:
              15-14 trans.  A-value  4.15E-05 -> 4.15E+03
              17-15 trans.  A-value  8.15E-10 -> 8.15E-02
              19-13 trans.  A-value  5.79E-04 -> 5.79E+04
              19-16 trans.  A-value  5.70E-07 -> 5.70E+01
              18-16 trans.  A-value  3.63E-10 -> 3.63E-02
  The errors occurred in transcription from the Wiess, Smith, Glennon
  tables by Summers.  These very small A-values have no impact on
  neutral helium population calculations.  The following change has
                9- 4 trans.  A-value  7.08E+07 -> 7.06E+07
  has also been made matching the NIST-DAS tabulation.

                                             H.P. Summers, 29 Jan. 1997



  Update:

  A further revision of excitations from  2(3)S and 2(1)S has
  taken place in association with FOM-KVI (R. Hoekstra, F de Heer,
  F. Bliek) making use of converged close coupling calculations.  The
  new data has replace the older data above where there is overlap.
  The new preferred cross-section data are archived as
             JETSHP.KVI.DATA(EXC#HE0D)
  The rate parameters are produced in ADF04 format by the code
             JETSHP.COPASE.FORT(NEUTQD2)


                                             H.P. Summers, 3 Feb. 1997
  Update:

  An error in the 4(1F) and 4(3F) transitions from the 2(1S) and 2(3S)
  metastables has been detected by Mathias Brix.  The 4(1F) and 4(3F)
  transition indices have been interchanged.  The transitions affected 
  are 17-2, 18-2, 17-3 and 18-3.  A further statistical weight error 
  was detected which means that the upsilon for the new 18-3 
  transition is 1/3 of the old 17-3 value.  The corrections have been
  made.


                                             H.P. Summers, 3 June. 1998
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