He II, O III lines?

by Piano man
Tags: lines
Piano man
Piano man is offline
Sep10-11, 12:06 PM
P: 75
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?

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Ken G
Ken G is offline
Sep10-11, 12:53 PM
PF Gold
P: 3,075
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."
Piano man
Piano man is offline
Sep10-11, 02:51 PM
P: 75
Thanks, that rings a bell alright - had a feeling it was something along those lines (no pun intended...) Cheers :D

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