Lecture 1. Birth of Quantum Mechanics. Historical Background of QM Lecture 1. Birth of Quantum Mechanics. Historical Background of QM. Experiments, Theories & Student Presentation Engel, Ch. 1 Ratner & Schatz, Ch. 1 Quantum chemistry, D. A. McQuarrie (1983), Ch. 1 Molecular quantum mechanics, Atkins & Friedman (4th ed. 2005), Ch. 0 Introductory quantum mechanics, R. L. Liboff (4th ed, 2004), Ch. 2 Experiments are the only means of knowledge at our disposal. The rest is poetry, imagination. - Max Planck -

History of QM: Presentation Plan (Final) 1885 – Johann Balmer – Line spectrum of hydrogen atoms 1886 – Heinrich Hertz – Photoelectric effect experiment 1897 – J. J. Thomson – Discovery of electrons from cathode rays experiment 1900 – Max Planck – Quantum theory of blackbody radiation 1905 – Albert Einstein– Quantum theory of photoelectric effect 1910 – Ernest Rutherford – Scattering experiment with a-particles 1913 – Niels Bohr – Quantum theory of hydrogen spectra 1923 – A. H. Compton – Scattering experiment of photons off electrons 1924 – Wolfgang Pauli – Exclusion principle – Ch. 10 1924 – Louis de Broglie – Matter waves 1925 – Davisson and Germer – Diffraction experiment on wave properties of electrons 1926 – Erwin Schrodinger – Wave equation – Ch. 2 1927 – Werner Heisenberg – Uncertainty principle – Ch. 6 1927 – Max Born – Interpretation of wave function – Ch. 3 particle wave

1900 – Max Planck: Quantum theory of blackbody radiation What is a blackbody radiation? Any example in real life? What is a classical theory for it? What is “UV catastrophe”? What is Planck’s assumption? How did it resolve the dilemma? Team 1 : Seongyu - Jonghoon Team 2 : Najib - Jisu

1886 – Heinrich Hertz: Photoelectric effect experiment 1897 – J. J. (Joseph John) Thomson: Discovery of electrons 1905 – Albert Einstein: Quantum theory of photoelectric effect 1910 – Ernest Rutherford – a-particle scattering experiment 1923 – A. H. Compton: Photon-electron scattering experiment What is a photoelectric effect? How was an electron found? What was the dilemma in the photoelectric effect? What is Einstein’s assumption? How did it resolve the dilemma? Any application of the photoelectric effect in real life? How did Compton prove Einstein’s theory? Team 3 : Yongjune – Hanseong – Namsoo Team 4 : Tam – Hochan Team 5 : Jeonghyun - Changhoo – Yeonsu

1885 – Johann Balmer – Line spectrum of hydrogen atoms 1913 – Niels Bohr – Theory of atomic spectra Team 6 : Daekyeom – Jaewon – Youbin

1924 – Louis de Broglie – Matter waves 1925 – Davisson & Germer – Electron diffraction 1926 – G. P. (George Paget) Thomson – Electron diffraction 1926 – Erwin Schrodinger – Wave equation Team 7: Jungwoo – Taekheon Team 8: Cheol – Seonggwang Team 9: Hyunjin – Namgyu J. J. Thomson, dad, was awarded the Nobel prize (1906) for showing that the electron is a particle; G.P. Thomson, son, was awarded the Nobel prize (1937) for showing that the electron is a wave.