Databases

CRC Handbook of Chemistry and Physics
http://www.hbcpnetbase.com/
Data may be accessed after purchasing a personal or institutional subscription.

NIST Ground Levels and Ionization Energies for Neutral Atoms
http://physics.nist.gov/PhysRefData/IonEnergy/ionEnergy.html
Compilation of the currently accepted values of ground state and ionization energies of neutral atoms. These data inform semi-empirical atomic and molecular orbital calculations.

Tutorials

PhysicsWeb virtual laboratory
http://physicsweb.org/resources/index.cfm/Education/Interactive_experiments/
A collection of interactive applets on essential concepts of classical and modern physics. Of relevance to this chapter are the applets on wave motion, single-slit diffraction and time-dependent Schrodinger equation.

The Quantised World
http://nobelprize.org/physics/educational/quantised_world/intro-3.html
This site gives the history and people behind the development of quantum theory.

Quantum Physics
http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/schrcn.html#c1
HyperPhysics pages on quantum mechanics (i.e. details on operators, wave functions)

The Uncertainty Principle
http://theory.uwinnipeg.ca/physics/quant/node7.html
More on the uncertainty principle.