# Homework Help: Larmor precession pi/2 out of phase

1. May 6, 2012

### hangainlover

1. The problem statement, all variables and given/known data
I was going over the solution where it says $\s_x, s_y$ are out of phase by pi/2.
They first wrote equation of motion for $\s_x, s_y$ and then did something to the matrix and now the have equation of motion for $\s_+, s_-$
They rewrite $\s_x, s_y$ in terms of $\s_+, s_-$ to see that $\s_x, s_y$ are out of phase bi pi/2,
I dont get what they did to the matrix [0,-w;-w,0]

2. Relevant equations

3. The attempt at a solution
I was just trying to understand the solution. when i initially made an attempt, i only noticed $\s_x, s_y$ are precessing .
I have attached the solution

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Last edited: May 6, 2012