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Hello every body!

i need to plot the singlet- triplet splitting energy of He for the [tex]^{1}[/tex]S and [tex]^{3}[/tex]S states corresponding to the configurations (1s,ns), n=1 to 7, and then explain why the plot is like that!!!

please help. my problem is i don't exactly understand what it means? and what should i look for! i don't understand the question!

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# Homework Help: Singlet- triplet splitting energy of He! what does it mean?

**Physics Forums | Science Articles, Homework Help, Discussion**