Atkins, de Paula & Friedman: Physical Chemistry: Quanta, Matter, and Change 2e
Focus 2
Databases
CRC Handbook of Chemistry and Physics
www.hbcpnetbase.com/
Data may be accessed after purchasing a personal or institutional subscription.
Tutorials
Foundation of Quantum Theory
www.heretical.com/science/quantum1.html
Introduction to Quantum theory.
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.
A useful collection of resources covering this area
www.ias.ac.in/initiat/sci_ed/resources/chemistry/physical.html
Useful links from the Indian Academy of Sciences.