handout_L14_Quantum - Lecture 14 Intro to Quantum Mechanics...

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Lecture 14: Intro. to Quantum Mechanics • Reading: Zumdahl 12.5, 12.6 • Outline – Basic concepts. – A model system: particle in a box. – Other confining potentials. Quantum Concepts • The Bohr model was capable of describing the discrete or “quantized” emission spectrum of H. • But the failure of the model for multielectron systems combined with other issues (the ultraviolet catastrophe, workfunctions of metals, etc.) suggested that a new description of atomic matter was needed. Quantum Concepts (cont.) • This new description was known as wave mechanics or quantum mechanics. • Recall, photons and electrons readily demonstrate wave-particle duality. • The idea behind wave mechanics was that the existence of the electron in fixed energy levels could be though of as a “standing wave”. Quantum Concepts (cont.) • What is a standing wave? • A standing wave is a motion in which translation of the wave does not occur. • In the guitar string analogy (illustrated), note that standing waves involve nodes in which no motion of the string occurs.
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handout_L14_Quantum - Lecture 14 Intro to Quantum Mechanics...

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