The term symbol $$5^{2}S_{\frac{1}{2}}$$ is pronounced as "five squared S one-half," with the "5" indicating the valence shell corresponding to quantum number n=5. The expression originates from the term symbol used in the specification of many-electron atoms. The presence of the "5" is uncommon but signifies the incomplete valence shell. Understanding this notation is crucial for interpreting quantum states in atomic physics.
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In what branch of science does this expression come from?td21 said:$$5^{2}S_{\frac{1}{2}}$$
My guess is five-two-S-one-over-two. Any suggestion is appreciated. Thanks.
That's indeed uncommon, but probably that indicates that the valence shell, which is the only one incomplete, corresponds to n=5.Khashishi said:Why is there a 5 in front? As far as I know, the term symbol shouldn't have a 5 in front.