Absorption cross sections of hydrogen ions

  1. hello,

    i need the values for the absorption cross sections of positive hydrogen ions for a specific set of wavelengths, Halpha to start with. At first i thought finding this on the web was easy, but turns out to not be trivial at all. If you can help me, i also need the (reliable) source where it comes from, a value alone will help me for a brief moment, but will bring me back to the problem in the long run (i think the scientific community will burn me if i try to publish something like 'i got this value from someone on an online physics forum')
     
  2. jcsd
  3. euhm, this chart seems to just give spectral lines of hydrogen, while what i need are absorption cross sections, i.e. the measure of probability that the hydrogen ion absorbs a photon, this being dependent on the wavelength. I need this for a specific set of photon wavelenghts, one of which being 656.28 angstum (the Halpha line)
     
  4. oops
     
  5. Um, H alpha is the line for neutral hydrogen atom, not positive hydrogen ion!
     
  6. ok wait, i'm getting confused, or mixing up my basic physics, so let me go more broad:
    Let's say we have a postiive hydrogen ion being radiated by light with a very broad wavelength range. What wavelengths will get absorbed and what is the corresponding absorption cross section?
     
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