Values of the agular momentum quantum number

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Discussion Overview

The discussion centers around the relationship between the principal quantum number and the angular momentum quantum number, specifically the condition that l must be less than or equal to n-1. Participants explore the derivation of this relationship within the context of quantum mechanics, particularly in relation to the Schrödinger equation and hydrogen atom solutions.

Discussion Character

  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant inquires about the derivation of the relationship l ≤ n-1 and its implications.
  • Another participant explains that this relationship arises from solving the Schrödinger equation for the hydrogen atom, detailing the separation of variables and the resulting equations.
  • The explanation includes the mention of the Colatitude equation and the Azimuthal Equation, leading to the conclusion that solutions exist only for integer values of l up to n-1.
  • A later reply notes that this restriction is specific to hydrogenic systems.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the derivation process, as the inquiry remains open-ended and further clarification is sought. There are multiple viewpoints regarding the implications of the quantum numbers.

Contextual Notes

The discussion does not resolve the mathematical details of the derivation, and assumptions regarding the applicability of the results to non-hydrogenic systems are not fully explored.

fkliment2000
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Hello!

Why is it the case, that the principle quantum number limits the values of the angular momentum quantum number like

l <= n-1

How is it possible to derive this?


Thank you for your answers.
 
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It falls out the the Schrödinger equation (SE) when solving the Hydrogen atom. On approach to solving the SE is to separate the variables into different equations. In order to solve the SE, we separate the radial part and set it equal to a constant. This yields what is known as the Colatitude equation. We then separate the Azimuthal Equation (which coincidentaly is the easiest to solve) and solve. This gives the value of the constant in the Colatitude equation and the azimuthal quantum number. We then solve the Colatitude equation using ploynomial expansion and obtain solutions of the form [itex]C = l(l+1)[/itex] and the solution only exists if l = 0,1,2,3,...,n-1

More information is available at http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/hydsch.html#c2
 
Thanks very much! :smile:
 
Also, note that this restriction only holds for hydrogenic systems.
 

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