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Apr 3, 2022 at 3:05 vote accept Dan Romik
Mar 30, 2022 at 15:36 comment added Dan Romik I found another paper, “The importance of basis states: an example using the hydrogen atom”, that illustrates the complexity of the true “orbitals” picture in the even more basic setting of a hydrogen-like atom. This paper cites the paper you linked as its source of inspiration, incidentally.
Mar 30, 2022 at 7:32 comment added Dan Romik Fascinating! So the physics (and mathematics) of even a humble helium atom is infinitely richer than the naive descriptions found in textbooks/Wikipedia articles make it out to be, even before any relativistic effects are introduced. (And you're reminding me that even the hydrogen atom has continuum eigenstates, which is another cautionary note for people who think Wikipedia articles and introductory textbooks tell the whole story.) Thanks for the great answer and references!
Mar 30, 2022 at 7:26 history edited Carlo Beenakker CC BY-SA 4.0
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Mar 30, 2022 at 6:45 history answered Carlo Beenakker CC BY-SA 4.0