- #1
SQUB
- 4
- 2
- Homework Statement
- Neglecting quantum effects, estimate the work function of a metal which consists of equivalent atoms arranged in a cubic lattice with a lattice constant a.
--> Show that the method of images fails at small distances.
--> Solve the problem, assuming that the electron approaches the crystal along the line perpendicular to the (100) surface, which passes through the middle of a face formed by four nearest-neighbor ions. For simplicity, neglect the effect of all other ions.
- Relevant Equations
- Ek=hf-ϕ
Hi everyone, I have to solve this homework without having any books where to find the theroical topic or examples, so if you could help me find materials that I can use to understand or you want to try help me understand how to get the solution would be very helpfull. I don't have enough time to read a long discussion about this topic before doing the assigment but if you send me also those I will defintly read them before the exam :) .
Things I think I have understood:
-the work function is the minimum energy required to extract one electron from a metal
-the electron's gain of kinetic energy (Ek) is the difference between incident photon energy (hf) and work function of the metal (ϕ)
-if i know the threshold frequency of the metal (f0) obviously I can write ϕ=h*f0Some questions:
-Is the "method of image" the method of image charges that for example can be used to find the field of a charge near a conducting surface?
- What is the (100) surface ?Lots of karma to everyone who want to help!
Things I think I have understood:
-the work function is the minimum energy required to extract one electron from a metal
-the electron's gain of kinetic energy (Ek) is the difference between incident photon energy (hf) and work function of the metal (ϕ)
-if i know the threshold frequency of the metal (f0) obviously I can write ϕ=h*f0Some questions:
-Is the "method of image" the method of image charges that for example can be used to find the field of a charge near a conducting surface?
- What is the (100) surface ?Lots of karma to everyone who want to help!