# Time-Dependent Perturbation Theory - Two-level System

1. Mar 16, 2009

1. The problem statement, all variables and given/known data

See attached. The problem is labeled "Peatross 1". Don't worry, it's short. I just didn't feel like retyping it.

2. Relevant equations

Included in attempt.

3. The attempt at a solution

I'm not sure if I am doing this correctly, but here it goes.

I'll just do it for $$H'_{10}$$, since the method will be the same for both.

I think all I have to do is calculate $$\psi_0$$ and $$\psi_1$$ using the following formula (for a harmonic oscillator):

$$\left\langle x | \psi_n \right\rangle = \sqrt{\frac{1}{2^n\,n!}} \cdot \left(\frac{m\omega}{\pi \hbar}\right)^{1/4} \cdot \exp \left(- \frac{m\omega x^2}{2 \hbar} \right) \cdot H_n\left(\sqrt{\frac{m\omega}{\hbar}} x \right)$$

Then just compute the resulting integral (probably in Mathematica):

$$\int_{- \infty}^{\infty} \psi_0 exE_0 \sin{\omega_L t\psi_1^*} dx$$

Is this all there is to it, or am I missing something?

#### Attached Files:

• ###### Physics452HW12.pdf
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Last edited: Mar 16, 2009