In this Physics Review Letters article, which was published in 2013, but I found recently, the authors report photoionisation microscopy images of hydrogen atoms in various electronic states.
A. S. Stodolna, A. Rouzée, F. Lépine, S. Cohen, F. Robicheaux, A. Gijsbertsen, J. H. Jungmann, C. Bordas, and M. J. J. Vrakking, "Hydrogen Atoms under Magnification: Direct Observation of the Nodal Structure of Stark States," Phys. Rev. Lett., 2013, 110, 213001; url: http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.110.213001
Here are some non-paywall summaries of this work:
- physicsworld.com http://physicsworld.com/cws/article/news/2013/may/23/quantum-microscope-peers-into-the-hydrogen-atom
- APS Physics http://physics.aps.org/articles/v6/58
- io9 http://io9.gizmodo.com/the-first-image-ever-of-a-hydrogen-atoms-orbital-struc-509684901
I see images that look like $1s,\ 2s,\ 3s,\ \&\ 4s$ orbitals with appropriate number of nodes.
The solutions to the Schrodinger equation for hydrogen-like orbitals include wavefunctions corresponding to $p$ oribtals. Why did the authors not observe images that appear to look more like the $p$-orbitals?