1. History of Quantum Mechanics The concept of the wave nature of atomic particles. This is the foundation of the mathematical discipline. (1) From wave mechanics we can understand and predict the properties of molecules as individual entities (the so-called microscopic state); (2) The properties of molecules(the macroscopic state) can be obtained by applying statistical techniques to these microscopic results
Matter Waves 1. History of Quantum Mechanics The concept of the wave nature of atomic particles. This is the foundation of the mathematical discipline. (1) From wave mechanics we can understand and predict the properties of molecules as individual entities (the so-called microscopic state) ;(2) The properties of molecules (the macroscopic state) can be obtained by applying statistical techniques to these microscopic results
The birth of wave mechanics:(1)1924, de Broglie postulated that material particles would show wave-like characteristics; (2)1926, Schrodinger introduced an equation to define these characteristics. (3)1900, First proposed the conception of‘ quanta’ Quantum development: (1) The ' old quantum mechanics: Associate with the Bohr model of the atom;(2) The ' quantum mechanics: Associate mainly with the work of Heisenberg.(What is the aim of quantum mechanics proposed?)
The birth of wave mechanics: (1) 1924, de Broglie postulated that material particles would show wave-like characteristics;(2)1926, Schrödinger introduced an equation to define these characteristics. (3)1900, First proposed the conception of ‘quanta’. Quantum development: (1) The ‘old’ quantum mechanics: Associate with the Bohr model of the atom; (2) The ‘new’ quantum mechanics: Associate mainly with the work of Heisenberg. (What is the aim of quantum mechanics proposed?)
de broglie postulation: 1927, Verified by Davisson and germer. They showed that mono-energetic electrons scattered from crystalline nickel foil gave a diffraction pattern analogous to that showed by X-rays Similar experiments were carried out independently by G. P. Thomson, and later Stern showed that beams of heavier particles (H, He, etc.) showed diffraction patterns when reflected from the surfaces of crystals de broglie's expression for the wavelength of these matter waves is of high accuracy
de Broglie postulation:1927,Verified by Davisson and Germer. They showed that mono-energetic electrons scattered from crystalline nickel foil gave a diffraction pattern analogous to that showed by X-Rays. Similar experiments were carried out independently by G. P. Thomson, and later Stern showed that beams of heavier particles (H, He, etc.) showed diffraction patterns when reflected from the surfaces of crystals. de Broglie’s expression for the wavelength of these matter waves is of high accuracy
2. The wave-particle duality of light (1) Particle Character: The fact that light travels in straight lines, is reflected and refracted and has the ability to impart momentum to anything it strikes -Particulate model (2)Wave Character: The phenomena of diffraction and interference-Wave model When quantum theory was proposed the wave model was dominant The electromagnetic spectrum: Fig. 1 (The visible light is all band of electromagnetic
2. The wave-particle duality of light (1) Particle Character:The fact that light travels in straight lines, is reflected and refracted and has the ability to impart momentum to anything it strikes. -- Particulate model. (2) Wave Character: The phenomena of diffraction and interference.--Wave model. When quantum theory was proposed the wave model was dominant. The electromagnetic spectrum:Fig.1 (The visible light is all band of electromagnetic)
log(/m 210-1-2-3-4-5-6-7-8-9-10 Radio Microwave Ultro X-Ray Ⅴ iolet Ihfrared Visible (The speed of light in vacuum is dependence with frequency and wavelength?) The photoelectric effect: Light is able to cause electrons to be ejected from the surface of metals
(The speed of light in vacuum is dependence with frequency and wavelength?) The photoelectric effect:Light is able to cause electrons to be ejected from the surface of metals