helike_cpb03#be2.dat

• Spontaneous Emission: Be⁺²(i) → Be⁺²(j) + hv
• Electron Impact Excitation: Be⁺²(i) + e → Be⁺²(j) + e

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     From a 103 term R-matrix with pseudo states (RMPS) calculation.
     The close-coupling expansion included the 21 spectroscopic terms
     arising from the configurations 1s2, 1s2l, 1s3l, 1s4l, 2s2, and
     3s2.  In addition it, included the 84 pseudo-state terms arising
     from the configurations 1s5l with l = 0 to 4, and 1snl with n = 6
     to 11 and l = 0 to 5.  The spectrospic orbitals (1s - 4f) were
     determined from local potentials using Slater-type orbitals.  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 25.9 au. In the resonance
     region of the calculation, we used an energy mesh spacing of
     1.0e-03 Ryd; above all thresholds of the 1s5l configurations, we
     employed an energy-mesh spacing of 5.0e-02 Ryd up to a total
     energy of 18.4 Ryd.  The radiative rates were determined from
     an LS-coupling configuration-interaction expansion that employed
     all 103 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
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Dependents

• ADF04 cpb03_ls#be2.dat

Contributors

• Connor Ballance
• Don Griffin