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Table 2:

Photoionization and photodissociation reactions.
Species Process Threshold (eV) References for cross sections
H ionization 13.6 Samson (1966), Norwood et al. (1990)
H2 ionization 15.4 Chung et al. (1993),
      Yan et al. (1998), Yan et al. (2001)
  dissociative ionization 18.1 Chung et al. (1993)
  dissociation $\sim$25 Glass-Maujean & Schmoranzer (2005)
He ionization 24.6 Yan et al. (1998)
  double ionization 79.0 Samson et al. (1992)
CH4 ionization 12.6 Samson et al. (1989)
  dissociative ionizations 14.3 and 15.7 Samson et al. (1989)


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