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Preface vii
Basics of Kinematics and Dynamics 1
Brief review of basic kinematics 1
Bohr's principle of complementarity 7
Complementary observables 7
Algebraic completeness 13
Bohr's principle. Technical formulation 17
Composite degrees of freedom 17
The limit N to [infinity]. Symmetric case 19
The limit N to [infinity]. Asymmetric case 26
Bohr's principle. Quantum indeterminism 30
Brief review of basic dynamics 31
Equations of motion 31
Time transformation functions 33
Schwinger's quantum action principle 36
An example: Constant force 39
Insertion: Varying an exponential function 41
Time-independent Hamilton operator 43
Time-Dependent Perturbations 45
Born series 45
Scattering operator 48
Dyson series 50
Fermi's golden rule 52
Photon emission by a "two-level atom" 57
Golden-rule treatment 57
A more detailed treatment 60
An exact treatment 65
Driven two-level atom 68
Schrodinger equation 68
Resonant drive 71
Periodic drive 72
Very slow drive. Adiabatic evolution 74
Adiabatic population transfer 78
Equation of motion for the unitary evolution operator 81
Scattering 87
Probability density, probability current density 87
One-dimensional prelude: Forces scatter 91
Scattering by a localized potential 95
Golden-rule approximation 95
Example: Yukawa potential 100
Rutherford cross section as a limit 101
Lippmann-Schwinger equation 102
Born approximation 111
Transition operator 112
Optical theorem 114
Example of an exact solution 116
Partial waves 118
s-wave scattering 123
Angular Momentum 129
Spin 129
Addition of two angular momenta 134
Two spin-1/2 systems 137
Total angular momentum of an electron 138
External Magnetic Field 141
Electric charge in a magnetic field 141
Electron in a homogeneous magnetic field 148
Indistinguishable Particles 155
Indistinguishability 155
Bosons and fermions 157
Scattering of two indistinguishable particles 161
Two-electron atoms 165
Variational estimate for the ground state 165
Perturbative estimate for the first excited state 171
Self-consistent single-electron wave functions 173
A glimpse at many-electron atoms 175
Index 181
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