| Foreword I | 5 |
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| Foreword II | 5 |
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| Preface | 11 |
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| Acknowledgements | 18 |
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| Contents | 19 |
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| About the Authors | 27 |
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| 1 Atomic Structure and Quantum Mechanics | 29 |
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| Abstract | 29 |
| 1.1 The Long Road from Democritus to Bohr | 30 |
| 1.1.1 Arcadian Antiquity | 30 |
| 1.1.2 Along the Centuries, to the Positivist Era | 32 |
| 1.1.3 Bohr’s Atomic Model: Natura Facit Saltus! | 33 |
| 1.2 The Dawn of Quantum Theory and the Founding Fathers | 39 |
| 1.2.1 The Revolutionary Milieu and Quantum Mechanics | 39 |
| 1.2.2 Modus Operandi: Waves and Operators | 40 |
| 1.2.3 The Schrödinger Equation and Schrödinger’s Cat | 45 |
| 1.2.4 The Heisenberg Equations: Uncertainty and Matrix Mechanics | 47 |
| 1.2.5 Hamiltonian Matrices, Non-orthogonal Bases, Variational Methods | 51 |
| 1.3 Atomic Shell Structure and the Spherical Harmonics | 55 |
| 1.3.1 Atomic Orbitals and Quantum Numbers: The Radial-Angular Factorization of the Atomic Wave Functions | 55 |
| 1.3.2 Intuitive Primer on the Pattern of Atomic Orbitals | 57 |
| 1.3.3 Toward Setting the Schrödinger Equation in Atoms | 62 |
| 1.3.4 The Schrödinger Equation for the One-Electron Atom: The Radial Part | 64 |
| 1.3.5 A Qualitative Analysis of the Radial Nodal Structure of the Atomic Orbitals | 68 |
| 1.3.6 The Complete Analytic Formulas of the Atomic Orbitals | 70 |
| 1.3.7 A Philosophical Divagation | 72 |
| 1.4 Elements of Relativistic Quantum Mechanics | 73 |
| 1.4.1 The Electronic Spin, the Missing Link Between Atomic Shell Scheme and Chemical Systematics from the Periodic Table of Elements | 73 |
| 1.4.2 First Principles of Relativistic Quantum Mechanics: Klein-Gordon and Dirac Equations | 77 |
| 1.4.3 The Quantum Numbers of Dirac Relativistic Equations | 80 |
| 1.4.4 The Two Quantum Worlds of Dirac Equations: Small and Large Spinor Components | 81 |
| 1.4.5 Toward the Relativistic Atom: Electromagnetism Instead of Electrostatics | 83 |
| 1.4.6 Concluding the Types of Relativistic Hamiltonian Terms: Zeeman, Spin–Orbit, Mass-Correction, Darwin, Breit, Breit-Pauli | 86 |
| 1.4.7 The Spin–Orbit Coupling: A Term to Remember | 88 |
| 1.5 Perturbation Theory Application: Quantum Polarizability | 93 |
| 1.6 Atomic Stability: The Proof by Quantum Path Integrals | 103 |
| 1.6.1 Schrodinger Equation by Quantum Path Integral | 103 |
| 1.6.2 Feynman-Kleinert Effective Density Formalism | 107 |
| 1.6.3 Quantum Smeared Effects and the Stability of Matter | 112 |
| 1.6.4 Ground State (? ? ?, T ? 0 K) Case | 118 |
| 1.7 Free and Observed Quantum Evolution: Extended Heisenberg Uncertainly Relationship (HUR) by Path Integrals | 121 |
| 1.7.1 HUR by Periodic Paths | 122 |
| 1.7.2 Wave-Particle Ratio Function | 125 |
| 1.7.3 Extended HUR | 127 |
| 1.8 Conclusions | 131 |
| References | 132 |
| 2 Wave Function Theories and Electronic Structure Methods: Quantum Chemistry, from Atoms to Molecules | 135 |
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| Abstract | 135 |
| 2.1 Poly-electronic Wave Functions from Spin-Orbitals | 136 |
| 2.1.1 Indiscernible Electrons and Anti-symmetric Wave Functions with Slater Determinants | 136 |
| 2.1.2 Matrix Elements in a Basis of Slater Determinants: The Slater Rules | 141 |
| 2.1.3 The Atomic Integrals: The Slater–Condon Symmetry Factorization of the Two-Electron Integrals | 147 |
| 2.1.4 Orbital and Spin Quantum Numbers in the Poly-electronic Atom: The Spectral Terms | 150 |
| 2.1.5 Slater Rules at Work: A Hands-On Example on the Helium Atom | 157 |
| 2.2 Atoms with Many Electrons: A Guided Tour Through Selected Examples | 165 |
| 2.2.1 Spectra
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