Fund Quantum Mechanics Lect & HW Solutions 17

Fund Quantum Mechanics Lect & HW Solutions 17 -...

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D.45 Motion through crystals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 D.45.1 Propagation speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 D.45.2 Motion under an external force . . . . . . . . . . . . . . . . . . . . . 160 D.45.3 Free-electron gas with constant electric ±eld . . . . . . . . . . . . . 160 D.46 Derivation of the WKB approximation . . . . . . . . . . . . . . . . . . . . . 160 D.47 Born di²erential cross section . . . . . . . . . . . . . . . . . . . . . . . . . . 160 D.48 About Lagrangian multipliers . . . . . . . . . . . . . . . . . . . . . . . . . . 160 D.49 The generalized variational principle . . . . . . . . . . . . . . . . . . . . . . 160 D.50 Spin degeneracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 D.51 Born-Oppenheimer nuclear motion . . . . . . . . . . . . . . . . . . . . . . . 161 D.52 Simpli±cation of the Hartree-Fock energy . . . . . . . . . . . . . . . . . . . 161 D.53 Integral constraints .
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