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Information about absorption cross section

  1. Apr 3, 2015 #1
    Hydrogen - Halpha cross section
    i need the absorption cross section for the absorption of an H-alpha photon by a hydrogen atom, in the correct state of course, which i'm pretty sure is neutral hydrogen, n=2.
    I am needing this for a project, so i also need a reliable source where this comes from.
    Thanks beforehand and friendly regards,
  2. jcsd
  3. Apr 8, 2015 #2
    I don't have the value for you, but I usually use the NIST database for atomic information. Try at http://www.nist.gov/pml/data/asd.cfm , the Lines section appears to have also transition probabilities.
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