Abstract
We study the structure of the discrete spectrum of pseudorelativistic Hamiltonians H for atoms and positive ions with finite-mass nuclei and with n electrons, where n ≥ 1 is arbitrary. The center-of-mass motion cannot be separated, and hence we study the spectrum of the restriction H P of H to the subspace of states with given value P of the total momentum of the system. For the operators H P we discover a) two-sided estimates for the counting function of the discrete spectrum σ d (H P ) of H P in terms of the counting functions of some effective two-particle operators; b) the leading term of the spectral asymptotics of σ d (H P ) near the lower bound inf σess(H P ) of the essential spectrum of H P . The structure of the discrete spectrum of such systems was known earlier only for n=1.
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Zhislin, G.M. The Hamiltonians of Pseudorelativistic Atoms with Finite-Mass Nuclei: The Structure of the Discrete Spectrum. Functional Analysis and Its Applications 38, 151–156 (2004). https://doi.org/10.1023/B:FAIA.0000034046.99025.5b
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DOI: https://doi.org/10.1023/B:FAIA.0000034046.99025.5b