Why are the transitions in a Caesium atom called D1 and D2?

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Discussion Overview

The discussion revolves around the naming conventions of the transitions in a Caesium atom, specifically the transitions from 6P(1/2) to 6S(1/2) and from 6P(3/2) to 6S(1/2), referred to as D1 and D2. The inquiry touches on aspects of spectroscopy and historical naming practices.

Discussion Character

  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant questions whether the names D1 and D2 are merely conventional designations.
  • Another participant suggests that the names derive from spectroscopy and relate to the historical designation of the sodium doublet, indicating a broader context for these names across alkali atoms.
  • The D1 and D2 lines are noted to correspond to the fine splitting of the excited states, with a caution against confusing these with higher D-states.

Areas of Agreement / Disagreement

There is no explicit consensus on the naming conventions, but participants provide insights into the historical context and technical aspects of the transitions.

Contextual Notes

The discussion does not resolve the initial question regarding the conventionality of the names, nor does it clarify all assumptions related to the historical context of the designations.

TheDestroyer
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Hello people,

I was just wondering about the names of the transitions in a Caesium atom. Why are the transitions from 6P(1/2) to 6S(1/2) and from 6P(3/2) to 6S(1/2) called D1 and D2 respectively? is it just a conventional "name"?

Thank you for any efforts.
 
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OMG... is the question that difficult? come on guys!

Probably this explains why google doesn't have a single answer :(
 
Hello TheDestroyer! :smile:

The names come from spectroscopy.

See http://en.wikipedia.org/wiki/Fraunhofer_lines" …

The D1 and D2 lines form the well-known "sodium doublet", the centre wavelength of which (589.29 nm) is given the designation letter "D".

This historical designation for this line has stuck and is given to the all the transitions between the ground state and the first excited state of the other alkali atoms as well.

The D1 and D2 lines correspond to the fine splitting of the excited states. This may be confusing because the excited state for this transition is the P-state of the alkali and should not be confused with the higher D-states​
:wink:
 
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Thank you so much pal :). I got it!
 

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