Resolved Specific Ion Data Collections

Temperature Range
4.980 eV → 4.980 x 104 eV


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  • Spontaneous Emission: Ar+16(i) → Ar+16(j) + hv
  • Electron Impact Excitation: Ar+16(i) + e → Ar+16(j) + e
1s2 1S0.0 0.0 cm-1
1s1 2s1 3S1.0 25061700.0 cm-1
1s1 2p1 3P0.0 25207000.0 cm-1
1s1 2p1 3P1.0 25216400.0 cm-1
1s1 2s1 1S0.0 25227700.0 cm-1
1s1 2p1 3P2.0 25240700.0 cm-1
1s1 2p1 1P1.0 25354000.0 cm-1
1s1 3s1 3S1.0 29661200.0 cm-1
1s1 3p1 3P0.0 29701000.0 cm-1
1s1 3p1 3P1.0 29703600.0 cm-1
1s1 3s1 1S0.0 29703900.0 cm-1
1s1 3p1 3P2.0 29710700.0 cm-1
1s1 3d1 3D1.0 29733600.0 cm-1
1s1 3d1 3D2.0 29734100.0 cm-1
1s1 3d1 3D3.0 29736900.0 cm-1
1s1 3d1 1D2.0 29738000.0 cm-1
1s1 3p1 1P1.0 29740800.0 cm-1
1s1 4s1 3S1.0 31248400.0 cm-1
1s1 4p1 3P0.0 31264700.0 cm-1
1s1 4s1 1S0.0 31265400.0 cm-1
1s1 4p1 3P1.0 31265800.0 cm-1
1s1 4p1 3P2.0 31268700.0 cm-1
1s1 4d1 3D1.0 31278000.0 cm-1
1s1 4d1 3D2.0 31278300.0 cm-1
1s1 4d1 3D3.0 31279400.0 cm-1
1s1 4f1 3F2.0 31279900.0 cm-1
1s1 4f1 3F3.0 31279900.0 cm-1
1s1 4d1 1D2.0 31280000.0 cm-1
1s1 4f1 3F4.0 31280600.0 cm-1
1s1 4f1 1F3.0 31280600.0 cm-1
1s1 4p1 1P1.0 31280900.0 cm-1


     Overview: Results are from a 31 level intermediate coupling frame
               transformation R-matrix calculation including resonance
               effects and radiation damping for helium-like argon.

     Reference:  A D Whiteford N R Badnell C P Ballance
		  M G O'Mullane H P Summers A L Thomas
		  J Phys B 34 3179--3191 (2001)
                 A radiation-damped R-matrix approach to the electron-
                 impact excitation of helium-like ions for diagnostic
                 application to fusion and astrophysical plasmas.

     Level energies: The level energies are theoretical, computed by
                     an AUTOSTRUCTURE calculation. They have not been
                     altered to best theoretical values. For precision
                     see referenced paper.

     Transition Probabilities: These are theoretical, computed by
                               AUTOSTRUCTURE. They include electric
                               dipole, electric quadropole and magnetic
                               dipole values.  These data are
                               consistent with the cross-section
                               calculations. For precision see
			        referenced paper. For correct
			        collision-radiative modelling one must
			        include the two photon decay process
			        from 1s2s 1S0 to 1s2 1S0, i.e. the 5-1
			        transition. This can safely be modelled
			        as a radiative rate but no such rate has
				been included.

     Rate coefficients: Detailed attention has been given to the high
                        energy behaviour of the collision strengths as
                        they approach their limiting values, calculated
                        by AUTOSTRUCTURE.  At low energies, the
                        resonance structure was resolved sufficiently
                        to calculate rate coefficients down to 3E5 K.
                        For more details see the referenced paper.
                        Errors of around 20% are expected for the
                        3E5--3E8 temperature range with lesser errors
                        for some transitions (notably the dipoles).
                        Data below this range should be treated as
                        unreliable but preferable to extrapolation of
                        the effective collision strength as a constant
			 as this is inappropriate for the weak,
			 resonance dominated, transitions.

     Author: A D Whiteford              
     Date:   20/07/01                


     Allan Whiteford, 17/02/09
       * Made energy level list more standard



  • Allan Whiteford
  • Nigel Badnell
  • Connor Ballance
  • Martin O'Mullane
  • Hugh Summers
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