How do you know the change in ml for a transition?

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SUMMARY

The discussion focuses on the criteria for allowed transitions in quantum mechanics, specifically regarding the change in magnetic quantum number (ml) during an electron transition from the 3p to the 1s shell. It is established that for a transition to be permitted, the change in ml (Δml) must equal zero. The participant references the quantum mechanical rules outlined in the provided link, highlighting the relationship between the angular momentum quantum number (l) and the magnetic quantum number (ml), emphasizing that Δl = 1 is a necessary condition for such transitions.

PREREQUISITES
  • Understanding of quantum mechanics principles, particularly angular momentum.
  • Familiarity with quantum numbers: principal (n), angular momentum (l), and magnetic (ml).
  • Knowledge of electron shell transitions and their significance in quantum theory.
  • Ability to interpret quantum mechanical equations and rules.
NEXT STEPS
  • Study the implications of Δml = 0 in quantum transitions.
  • Explore the quantum mechanical rules for allowed transitions in detail.
  • Learn about angular momentum coupling and its effects on electron transitions.
  • Investigate the mathematical derivation of quantum numbers and their relationships.
USEFUL FOR

This discussion is beneficial for physics students, quantum mechanics researchers, and educators looking to deepen their understanding of electron transitions and the rules governing them.

Jt00
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For example, consider a transition of an electron from the 3p to the 1s shell. You know Δl = 1 because of the change from a p shell to an s shell, but I was taught that ml = -l, -l + 1, ..., l. However, to be an allowed transition, Δml must be equal to zero. If ml is a set of numbers, how do you know it's equal to zero so a transition can be allowed?
 
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