Physics Today.

@article{Howard1966PhysicsT,
  title={Physics Today.},
  author={J N Howard},
  journal={Applied optics},
  year={1966},
  volume={5 6},
  pages={
          1017
        }
}
Visualizing electronic orbitals. The image of an atom is really the image of the averaged likelihood that the electrons will be at various places. Physicists at Arizona State University have now imaged the cloud of bonding electrons in copper oxide and shown that they look just the drawings used for decades in quantum physics textbooks. Using a combination of x-ray diffraction and electron diffraction (to avoid multiple x-ray scattering problems), the scientists produced a three-dimensional map… 

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