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## Homework Statement

I am studying my lecturer's notes and in this part he uses a delta potential to illustrate a simple example of Fermi's golden rule, that the rate of excitation is ##\propto t##.

## Homework Equations

## The Attempt at a Solution

I've managed to get the bound states, by solving boundary conditions. They turn out to be ##\frac{\sqrt{Wm}}{\hbar}exp(-\frac {mW|x|}{\hbar^2})##.

How are the continuum states derived? And why do only odd parity states contribute, when there is a perturbation ##-Fxe^{-i\omega t}##?