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I think excited states of Argon atom is described by j,l coupling written as^{(2s+1)}[K]_{J}.

However, when I read some papers describing cross section data for Argon atom, data are quoted with strange notation, Paschen notation. I tried to study the Paschen notation and found that its form is likenl(ex:_{#}2p)._{10}nandlhere are principal and orbital quantum number for an excited electron. Okay, that's easy. However, I really can't exactly figure out what subscript number # means! I just guess that this number is just a label of each state associated with particularnandl. However...which state is labeled 10? which state is 9? which state is 8??

Could you tell me what labeling order is used in the Paschen notation? I would be very happy if you give me a detailed description of the notation or any good material well describing the notation.

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# A Paschen notation for electronic states of Argon atom

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