Angular Momentum: Spin 1/2 Quantum Number Clarification

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SUMMARY

The discussion clarifies the concept of spin in quantum mechanics, specifically addressing the spin-1/2 quantum number associated with particles like electrons and protons. It confirms that the spin quantum number (s) is indeed 1/2, and the total spin angular momentum is represented as 1/2 ħ for each particle, not √3/2 ħ. The confusion arises from interpreting the total angular momentum versus the z-component of angular momentum, which is correctly identified as 1/2 ħ.

PREREQUISITES
  • Understanding of quantum mechanics principles, particularly angular momentum.
  • Familiarity with the concept of spin quantum numbers.
  • Knowledge of ħ (h-bar) and its significance in quantum physics.
  • Basic comprehension of hydrogen atom structure and its components.
NEXT STEPS
  • Study the mathematical representation of angular momentum in quantum mechanics.
  • Learn about the implications of spin-1/2 particles in quantum field theory.
  • Explore the differences between total angular momentum and its components.
  • Investigate the role of spin in atomic structure and electron configurations.
USEFUL FOR

Students of quantum mechanics, physicists specializing in particle physics, and anyone seeking to deepen their understanding of angular momentum and spin in quantum systems.

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Homework Statement



Im reading about the electrom which apparently is spin -1/2

But doesn't this mean that s, i.e. the spin quantum number = 1/2. Surely the total spin it carries is root 3/2 hbar not 1/2 hbar? Yet in my book it says: "For example, in a hydrogen atom both the proton and the electron carry angular momentum 1/2hbar by virtue of their spins.."

Am I missing something?


Homework Equations





The Attempt at a Solution



Please see above..
 
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You are correct. 1/2 hbar would be the z-component of the spin angular momentum (the component along any axis), not the total angular momentum. I'd say the book was a bit sloppy.
 

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