## Abstract

This paper is concerned with the Schrodinger equation for atoms and ions with N = 1 to 10 electrons. In the asymptotic limit of large nuclear charge Z, we determine explicitly the low-lying energy levels and eigenstates. The asymptotic energies and wavefunctions are in good quantitative agreement with experimental data for positive ions, and in excellent qualitative agreement even for neutral atoms (Z = N). In particular, the predicted ground state spin and angular momentum quantum numbers (^{1}S for He, Be, Ne, ^{2}S for H and Li, ^{4}S for N, ^{2}P for B and F, and ^{3}P for C and O) agree with experiment in every case. The asymptotic Schrödinger ground states agree, up to small corrections, with the semiempirical hydrogen orbital configurations developed by Bohr, Hund, and Slater to explain the periodic table. In rare cases where our results deviate from this picture, such as the ordering of the lowest ^{1}D° and ^{3}S° states of the carbon isoelectronic sequence, experiment confirms our predictions and not Hund's.

Original language | English |
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Pages (from-to) | 631-664 |

Number of pages | 34 |

Journal | SIAM Journal on Mathematical Analysis |

Volume | 41 |

Issue number | 2 |

DOIs | |

State | Published - 2009 |

## Keywords

- Aufbau principle
- Electronic structure
- Hund's rules
- Periodic table
- Quantum chemistry
- Schrödinger equation