CHEM 1314 Lecture 2: Chapter 2 (1.20.16)
Document Summary
Developed by gerd binnig and heinrich rohrer in 1981. Device that can image and even move individual atoms and molecules using a very fine conducting tip (electrode). The tip is only one atom wide and scans very close to the surface: apply voltage to the electrode while it scans the surface. The electrons tunnel on the surface creating tunneling current. The up and down movement of the tip gives the image of the atoms on the surface. Early ideas about the building blocks of matter. Leucippus and his student democritus were the first to propose that matter a composed of small, indestructible particles. Plato and aristotle did not agree: they thought that matter had no smallest parts and were instead composed of various proportions of fire, air, water, and earth. An english chemist john dalton created the atomic theory. The theory that all matter is composed of atoms grew out of observations and laws.
