Single-Ion Line Ratios

• H-like oxygen at kT = 10 eV (weakly temperature dependent)

  • When higher order Lyman lines are absorbed, there is a ~80% chance (depending on the principal quantum number) for the line to be re-emitted. The other ~20% of the time, the line is radiated in the Balmer, Paschen, etc. lines, and eventually as either a lower-order Lyman line or 2-photon emission from the 2s level.