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Have there been any experiments performed (or proposed) to prove that the shapes of the s,p,d,f orbitals correspond to our spatial reality as opposed to just being a figment of the mathematics that give us something to visualize?

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A few years ago the XUV physics group at the AMOLF Institute in Amsterdam were (to my knowledge the first to be) able to directly image the orbitals of excited hydrogen atoms using photoionization microscopy. For more details see the paper,

Hydrogen Atoms under Magnification: Direct Observation of the Nodal Structure of Stark States. A.S. Stolodna et al. Phys. Rev. Lett. 110 213001 (2013).

This was actually featured as one of Physics World Top 10 Breakthroughs of the year 2013. There is a nice open access Viewpoint on this if you want to read more

Viewpoint: A New Look at the Hydrogen Wave Function, C.T.L. Smeenk, Physics 6, 58 (2013)

For a more in-depth look, see

Taking snapshots of atomic wave functions with a photoionization microscope. A.S. Stodolna. PhD thesis, Radboud Universiteit Nijmegen, 2014.

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  • $\begingroup$ Thanks, and +1 for introducing me to photo-ionization microscopy! $\endgroup$ – user263399 Aug 13 '15 at 14:33
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The first images of hydrogen s orbitals were obtained in 2013 by physicists in the Netherlands.

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  • $\begingroup$ You beat me by 4 minutes ;) $\endgroup$ – Paul Aug 13 '15 at 14:01
  • $\begingroup$ Apologies Gert, I had already read the article linked by Paul and accepted the answer before I noted that your answer was submitted first and had precedence... Not the first time it's happened in history I'm sure :) $\endgroup$ – user263399 Aug 13 '15 at 14:37
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    $\begingroup$ You're certainly not required to accept the 'first' answer. Paul's is much more detailed, so I'd certainly consider it more helpful. $\endgroup$ – Joe Aug 13 '15 at 17:53
  • $\begingroup$ See, I always knew that elecron clouds are light blue :) $\endgroup$ – Hagen von Eitzen Aug 14 '15 at 6:30

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