Resolved Specific Ion Data Collections

Temperature Range
0.172 eV → 86.17 eV


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  • Spontaneous Emission: Be+1(i) → Be+1(j) + hv
  • Electron Impact Excitation: Be+1(i) + e → Be+1(j) + e
1s2 2s1 2S0.5 0.0 cm-1
1s2 2p1 2P2.5 31933.0 cm-1
1s2 3s1 2S0.5 88232.0 cm-1
1s2 3p1 2P2.5 96497.0 cm-1
1s2 3d1 2D4.5 98055.0 cm-1
1s2 4s1 2S0.5 115464.0 cm-1
1s2 4p1 2P2.5 118761.0 cm-1
1s2 4d1 2D4.5 119421.0 cm-1
1s2 4f1 2F6.5 119447.0 cm-1

     From a 49 term R-matrix with pseudo states (RMPS) calculation.
     The close-coupling expansion included the 9 spectroscopic terms
     arising from the configurations 2l, 3l, and 4l. In addition it,
     included the 40 pseudo-state terms arising from the configurations
     nl with n = 5 to 12 and l = 0 to 4.  The spectrospic orbitals
     (1s - 4f) were determined from a Thomas-Fermi Dirac-Amaldi
     statistical potential.  The pseudo orbitals were generated from
     a set of non-orthogonal Laguerre orbitals that were then
     orthogonalized to the spectroscopic orbitals and to each other.
     The screening parameters for the Laguerre orbitals were adjusted
     to obtain a good distribution of pseudo states above and below
     the ionization limit.  In STG3 of the R-Matrix calculation,
     the term energies were adjusted to the experimental values.

     For all LSPI partial waves from L=0 to 11, we performed an RMPS
     calculation with exchange.  For the LSPI partial waves from L=12
     to 50, we performed a no-exchange RMPS calculation. These partial
     waves were then topped up.  The size of the continuum basis was
     45 and the size of the R-matrix "box" was 41.5 au. In the resonance
     region of the calculation, we used an energy mesh spacing of
     9.0e-04 Ryd; above all thresholds of the 5l configurations, we
     employed an energy-mesh spacing of 1.9e-02 Ryd up to a total
     energy of 6 Ryd.  The radiative rates were determined from
     an LS-coupling configuration-interaction expansion that employed
     all 49 terms included in the close-coupling expansion for the
     RMPS calculation.

     The numbers in the last column of the above table are the theoretical
     values for the reduced effective collision strengths in the infinite
     temperature limit as defined in Burgess and Tully Astron. Astrophys.
     254 436 (1992).

     NAME: C Ballance and D Griffin    DATE: July 22, 2003



  • Connor Ballance
  • Don Griffin
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