Why does sodium have a doublet?

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Hi everyone i wanted to know why this is so, i know it has something to do with the quantum numbers but i want to know how and why? Your help will be greatly appreciated.
 

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  • #3
dextercioby
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It;s actually a quadruplet, as the hyperfine structure further splits each line in the 5890 and 5896 A in another 2.
 
  • #4
Gokul43201
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It;s actually a quadruplet, as the hyperfine structure further splits each line in the 5890 and 5896 A in another 2.
Why only 2? Are you neglecting the spin-splitting in the 3p states?
 
  • #5
jtbell
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