# What is the purpose of introducing the spin state along H

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1. Oct 10, 2015

### Pring

The more detail you can see the attachment. I don't understand why Rabi translate the state along z axial to H axial as shown the equations (8).

#### Attached Files:

• ###### RabiII37RP[Q].pdf
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2. Oct 15, 2015

### Greg Bernhardt

Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?

3. Oct 16, 2015

### Staff: Mentor

The choice of quantization axis is purely arbitrary, and calculations are much simpler when the quantization axis is chosen parallel to the field axis. That way, you remove the coupling of different $m$ states due to the field.

4. Oct 17, 2015

Thank you!