Bohr Model of the Hydrogen Atom Neils Bohr (1885 – 1962)

Matter Waves Louis de Broglie (1892 – 1987) l = h/p

Electron Diffraction Observed in 1927 Crystalline Nickel as an Electron Target L. H. Germer C. J. Davisson …studying electron scattering from a nickel target at Bell Laboratories. After heating the target to remove an oxide coating that had accumulated during an accidental break in the vacuum system, they found that the scattered-electron intensity as a function of the scattering angle showed maxima and minima. Their target had crystallized, and by accident they had observed electron diffraction. Physics by Paul A. Tipler

Electron as “Orbiting” Wave Constructive Interference Destructive Interference (Standing Wave) http://www.youtube.com/watch?v=_S7-PDF6Vzc

Quantized “Orbits” Due To Standing Wave Req.

Reformulations of Classical Mechanics Isaac Newton (1643 – 1727) Joseph Louis Lagrange William Hamilton (1736 – 1813) (1805 – 1865)

Now What? The wave function contains all possible information about a system, so instead of speaking of “the state described by the wave function Y,” we simply say “the state Y.” Quantum Chemistry by Ira N. Levine Erwin Schrodinger (1887 – 1961)

What is the Wave Function? Quantum mechanics does not say that an electron is distributed over a large region of space as a wave is distributed. Rather, it is the probability patterns (wave functions) used to describe the electron’s motion that behave like waves and satisfy a wave equation. Quantum Chemistry by Ira N. Levine Max Born (1882 – 1970)