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He II, O III lines?

  1. Sep 10, 2011 #1
    Hi everyone,

    I think this is a relatively straightforward question, but I can't find a simple answer for it on Google.
    What do the Roman numerals stand for in He II and O III in relation to spectroscopy?

    Thanks.
     
  2. jcsd
  3. Sep 10, 2011 #2

    Ken G

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    Gold Member

    He I is neutral, He II is once ionized, etc. A clunky notation, to be sure-- kind of like how 2011 is the "21st century."
     
  4. Sep 10, 2011 #3
    Thanks, that rings a bell alright - had a feeling it was something along those lines (no pun intended...) Cheers :D
     
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