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Hi, is this Grotrian diagram for helium wrong? I can't understand how a $1s2d$ state is possible since my understanding was that the $d$ states only start at $n=3$?

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You are right. This seems to be a typo. The term should be labeled $1s3d$, not $1s2d$.

See for example this Helium Grotrian diagram taken from lecture notes by astro.caltech.edu - SR Kulkarni - Ay126 Helium.
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