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Comments: The Verner+1996 cross sections include contributions by all shells. In the code this total cross section is treated as the valence electron cross section (and other cross sections are put to zero). It is also assumed that all transitions occur to the ground state of the ion. The cross section is ascribed to all substates in the ground multiplet.

For nebular phase, only photoionizations from the ground state and meta-stable states play any role: for higher states a rough approximation like the hydrogen one is sufficient. The hydrogen approximation used is fully described in J12. Note that even if the first excited state is connected to the GS by an allowed transition, it is effectively metastable due to photon trapping - detailed cross sections for all first or even second excited states are desirable. I mark these as (E), with (T) meaning truly metastable.

TOPBASE photoionisation cross sections unfortunately come without any specific paper references. Presumably the calculations are fully specified by the TOPBASE method paper Cunto W., Mendoza C., Ochsenbein F., Zeippen C.J., 1993, A&A 275, L5.

In SUMO only the three first ionization stages are included, so photoionisation data for the neutrals and singly ionised are needed.

Note that stimulated recombination is ignored in SUMO.

HI (Latest doc J11):

  • GS : Verner et al. 1996
  • Meta-stable :
    • n=2 (E) : Bethe & Salpeter 1957 (incorrect reference to TOPBASE in J11)
  • Rest up to 50 : Hydrogenic

HeI (Latest doc J11):

  • GS : Verner et al. 1996
  • Meta-stable :
    • 3S (T) : TOPBASE
    • 1S (T) : Hydrogenic
  • Rest up to 50 : Hydrogenic

HeII (Latest doc J11):

  • GS : Verner et al. 1996
  • Rest up to 50 : Hydrogenic

CI (Latest doc J11):

  • GS : Verner et al. 1996
  • Metastable:
    • 1D (T) : TOPBASE (Marked out)
    • 1S (T) : TOPBASE (Marked out)
    • 5S (T) : TOPBASE (Marked out)
  • Rest up to 50 : Hydrogenic

CII (Latest doc J11):

  • GS : Verner et al. 1996
  • Metastable:
    • 4P (T) : Hydrogenic
  • Rest up to 50 : Hydrogenic

NI (Latest doc J11):

  • GS : Verner et al. 1996
  • Metastable:
    • 2D (T) : TOPBASE
    • 2P (T) : Hydrogenic
    • 4P (E) : Hydrogenic
  • Rest up to 50 : Hydrogenic

NII (Latest doc J11):

  • GS : Verner et al. 1996
  • Metastable:
    • 2D (T) : Hydrogenic
    • 2S (T) : Hydrogenic
  • Rest up to 50 : Hydrogenic

OI (Latest doc J11):

  • GS (<912 A) : Verner et al. 1996
  • Metastable:
    • 1D, <1064 A (T) : 0 (forbidden)
    • 1S, <1315 A (T) : 0 (forbidden)
    • 5S, <2772 A (T) : TOPBASE, presumably Nahar+1998
  • Rest up to 50 : Hydrogenic

OII (Latest doc J11):

  • GS : Verner et al. 1996
  • Metastable:
    • 2D (T) : Hydrogenic
    • 2P (T) : Hydrogenic
    • 4P (T) : Hydrogenic
  • Rest up to 50 : Hydrogenic

NeI (Latest doc J11):

  • GS : Verner et al. 1996
  • Metastable:
    • 2[3/2], < 2506/2533 A (E) : Hydrogenic
    • 2[1/2], < 2556/2608 A (E) : Hydrogenic
  • Rest up to 50 : Hydrogenic

NeII (Latest doc J11):

  • GS : Verner et al. 1996
  • Metastable:
    • 2S (E) : Hydrogenic
  • Comments : 2-level atom

NaI (Latest doc J11):

  • GS : Verner et al. 1996
  • Metastable:
    • 2P (E) : Hydrogenic
  • Rest up to 50 : Hydrogen

MgI (Latest doc J11):

  • GS : Verner et al. 1996 (valence shell only)
  • Metastable:
    • s3p(3P) : TOPBASE
    • s3P(1P) : TOPBASE
    • s4s(3S) : TOPBASE
    • Rest up to 50 : Hydrogen

MgII (Latest doc J11):

  • GS : Verner et al. 1996
  • Metastable: 3p(2P*) : TOPBASE
  • Rest : Hydrogenic

SiI

  • GS, 1520 A : Verner et al. 1996
  • Metastable:
    • 3p2(1D), < 1680 A : Hydrogenic
    • 3p2(1S), < 1985 A : Hydrogenic
    • 3p3(5S), < 3084 A : Hydrogenic
    • Rest up to 50 : Hydrogen

SiII

  • GS, <758 A : Verner et al. 1996
  • Metastable:
    • 3-5, 3p2(P4) (T), < 1120 A : Hydrogenic
    • 6-7, 3p2(2D) (E), < 1306 A : Hydrogenic
    • 8, 4s(2S) (E) < 1506 A : Hydrogenic
    • 9, 3p2(2S) (E) < 1811 A : Hydrogenic
    • 10-11 3d(2D) (E), < 1903 A : Hydrogenic
    • Rest up to 50 : Hydrogen

SI

  • GS : Verner et al. 1996
  • Metastable:
    • 3p4(1D):TOPBASE
    • 3p4(1S): Hydrogenic
  • Rest up to 50 : hydrogenic

SII

  • GS : Verner et al. 1996
  • Metastable:
    • 3p3(2D*) : Hydrogenic
    • 3p3(2P*) : Hydrogenic
  • Rest up to 50 : Hydrogenic

ArI & II Verner for GS, hydrogenic for excited.

CaI

  • GS : Verner et al. 1996
  • Metastable: None
  • Rest up to 50 : Hydrogenic

CaII

Sc-Mn Verner+1996 for GS, hydrogenic all excited.

FeI (Latest doc J11).

  • GS : Verner et al. 1996
  • Metastable:
    • Levels up to 55 (4s b3H) have small or moderate A-values.
    • First excited (a5F) : Nahar online, rest hydrogenic.

FeII (Latest doc J11).

  • GS : Verner et al. 1996
  • Metastable :
    • Allow transitions start from level 64, so 1-63 can behave as metastable.
    • First excited (a4F) : Nahar & Pradhan 1994 via Nahar online (J11). Note erroneous reference to TOPBASE in J11.
    • Others up to 50 : Hydrogenic.

CoI

  • GS : Verner et al. 1996
  • Metastable:
    • First 30 excited states meta-stable : Hydrogenic
  • Rest up to 50 : Hydrogenic

CoII

  • GS : Verner et al. 1996
  • Metastable:
    • First 30 excited states meta-stable : Hydrogenic
  • Rest up to 50 : Hydrogenic

NiI

  • GS : Vernet et al. 1996
  • Metastable:
    • First 13 excited states meta-stable : Hydrogenic
  • Rest up to 50 : Hydrogenic

NiII (Latest doc J11):

  • GS : Verner et al. 1996
  • Metastable:
    • First 16 excited states meta-stable : Hydrogenic
  • Rest up to 50 : Hydrogenic
users/ajerkstrand/bound-free-photon.txt · Last modified: 2016/04/19 11:25 by Anders Jerkstrand

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