- #1
kmp
- 14
- 0
why sodium has two lines D1 and D2 ?
Why does sodium light have two distinct wavelengths?
- Context: Undergrad
- Thread starter kmp
- Start date
-
- Tags
- Light Sodium Wavelength
Click For Summary
Discussion Overview
The discussion centers on the phenomenon of sodium light exhibiting two distinct wavelengths, specifically the D1 and D2 lines. Participants explore the underlying quantum mechanical principles, including atomic transitions and fine structure splitting.
Discussion Character
- Technical explanation, Conceptual clarification, Debate/contested
Main Points Raised
- One participant questions why sodium has two lines, D1 and D2.
- Another participant attributes the splitting to spin-orbit coupling affecting the 3p orbital and removing degeneracy.
- A different participant suggests that the distinct wavelengths may arise from transitions between the s1/2 and p3/2, p1/2 and p3/2 states.
- Further clarification is provided that these transitions correspond to two fine levels: ^2P_{1/2} to ^2S and ^2P_{3/2} to ^2S.
- Additional resources are shared, including links to external explanations and images related to sodium's spectral lines.
Areas of Agreement / Disagreement
Participants present various explanations for the observed phenomenon, indicating that multiple competing views remain without a clear consensus on the primary cause of the two distinct wavelengths.
Contextual Notes
The discussion involves complex quantum mechanical concepts, and participants reference external sources for further clarification, indicating potential limitations in the shared understanding of the topic.
- #2
- 32,819
- 4,723
The spin-orbit coupling splits the 3p orbital and removes the degeneracy. Read here:
http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/sodium.html
Zz.
http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/sodium.html
Zz.
- #3
kmp
- 14
- 0
it may be due to transition between s1/2 and p3/2, p1/2 and p3/2 states
- #4
guerom00
- 90
- 0
Those are transitions from two fine levels.
That's ^2P_{1/2} \to ^2S and ^2P_{3/2} \to ^2S
That's ^2P_{1/2} \to ^2S and ^2P_{3/2} \to ^2S
- #5
- 12,179
- 186
In addition to ZapperZ's link, there is
http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/sodzee.html#c1
which has this image:
http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/sodzee.html#c1
which has this image:
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