# Reflection of different metals

by sophieyeomans
Tags: metals, reflection
 P: 214 Look at the different metals. Is the light being scattered from their surfaces different colors? What does this say about the frequencies of scattering? Quantum states? Now look at the standard dispersion equation which is: $$n = 1+\frac {q_e^2}{2m \epsilon }\sum_k \frac {N_k} {\omega_k^2 - \omega^2 + i\gama_k \omega}$$ Now the what happens when the $$\omega_k$$ of the metal approaches the $$\omega$$ of the source light? Under what conditions does the absorption peaks? how about scattering peaks? What affect does the $$i\gama_k \omega}$$ electron damping factor have on the above questions? Why do you think that when the surface oxidizes (which sends the $$\omega_k$$ all over the place) do we get a dull surface? Also think about interference. How does that affect the scattering? Why do we get a lot of scattering at certain angles and not at others?