Why does sodium have a doublet?

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Discussion Overview

The discussion revolves around the spectral lines of sodium, specifically addressing the reason behind the appearance of a doublet in its emission spectrum. Participants explore the underlying quantum mechanics, including quantum numbers and hyperfine structure, while seeking clarification on the nature of these spectral lines.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the relationship between quantum numbers and the sodium doublet, expressing a desire for a deeper understanding.
  • Another participant references an external source that discusses sodium's spectral lines, suggesting it as a starting point for further exploration.
  • There is a claim that the sodium doublet is actually a quadruplet due to hyperfine structure, which splits the lines further.
  • A follow-up question challenges the previous claim by asking about the neglect of spin-splitting in the 3p states, indicating a need for clarification on this aspect.
  • A participant shares a link to an example of a sodium lamp, suggesting a practical application related to the discussion.

Areas of Agreement / Disagreement

Participants express differing views on the nature of the sodium spectral lines, with some asserting it is a doublet and others arguing it is a quadruplet. The discussion remains unresolved regarding the specifics of the splitting mechanisms involved.

Contextual Notes

There are unresolved aspects regarding the definitions of the spectral lines and the assumptions about spin-splitting that may affect the understanding of the sodium doublet and its classification.

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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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It;s actually a quadruplet, as the hyperfine structure further splits each line in the 5890 and 5896 A in another 2.
 
dextercioby said:
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?
 

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