What do the '{` mean in atomic configurations e.g:

  • $\begingroup$ By "we" you likely mean the authors of the text where you found this. What do they say about their notation? $\endgroup$ – my2cts Feb 23 at 9:24
  • $\begingroup$ All I know is that these are some excited states of Oxygen ions. I am assuming this is some form of standard representation but cannot find any explanation which is why I am asking :) $\endgroup$ – wander95 Feb 23 at 23:07

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