Is there any collection of charge density maps for small molecules? Any good data at all?
My background is macromolecular crystallography; while experimental data was kept locked in the research laboratories in the 1980s, they are now widely available through the international protein database. For example, you can view the electron density of crambin at http://www.rcsb.org/3d-view/1EJG.

The database for smaller structures is the Cambridge Structural Database. They have implemented depositing experimental data (structure factors) in the 2000s, but I did not find an efficient way to search for those structures that come with structure factors.

Charge density maps are often visualized as 2D-sections of the experimental density minus the density expected from isolated atoms (deformation density). One software program to calculate these is MoPro. Another program is CrystalExplorer, which shows deformation densities in 3D. In all cases, you would have to have access to the structure factors to make your own figures.


  Is there any collection of charge density maps for small molecules? Any good data at all?


I don't think so.