Non-Rydberg effects in the photoabsorption spectra of atoms are described. They are observed at photon energies which correspond to the creation of a vacancy within the subvalence shells of the atom or to the simultaneous excitation of two electrons. The importance of synchrotron radiation as an experimental tool for the investigation of non-Rydberg effects is stressed, and many examples are given. Many of the non-Rydberg properties can be understood by analogy with elementary one dimensional potential well theory.
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J P Connerade (1978) studied this question.
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