He II, O III lines?

  • Thread starter Piano man
  • Start date
  • #1
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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.
 

Answers and Replies

  • #2
Ken G
Gold Member
4,438
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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."
 
  • #3
75
0
Thanks, that rings a bell alright - had a feeling it was something along those lines (no pun intended...) Cheers :D
 

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