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Absorption cross sections of hydrogen ions 
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#1
Jul914, 08:08 AM

P: 4

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
Jul914, 09:06 AM

P: 101



#3
Jul914, 09:14 AM

P: 4

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
Jul914, 09:33 AM

P: 101

Absorption cross sections of hydrogen ions
oops



#5
Jul914, 11:27 AM

P: 381




#6
Jul1014, 03:18 AM

P: 4

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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