lecture-09 - Chem111 Fall, 2005 Lecture 9: Introduction to...

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Chem111 Fall, 2005 1 Introduction ~1900 Æ change in the basic theory of atoms and molecules very exciting time in chemistry, physics and mathematics this sort of transition in science happens when least expected. History is full of statements like "everything important is understood" (even a local Case hero (Michelson of Michelson-Morley fame) is guilty of this kind of comment) for a long time, scientists thought classical mechanics (CM) could explain everything (end of 19th century) failure of CM to explain some experimental observations led to the development of quantum mechanics (QM) CM explains macroscopic world pretty well, but the microscopic world behaves in ways CM can't explain We will discuss 4 paradoxes and their consequences Æ develop a Q.M. picture of the atom Æ different from our day-to-day experience Æ can still be used to predict day-to-day behavior (i.e. consistent with the macroscopic) Correspondence Principle relationship between QM and CM must be continuous rules derived/postulated for Q.M. must apply to and account for C.M. Quantum Mechanics Classical Mechanics microscopic (atoms, molecules) macroscopic (matter = collection of atoms, molecules) Lecture 9: Introduction to Quantum Mechanics Waves Electromagnetic Spectrum Breakdown of Classical Mechanics: The Four Paradoxes
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Chem111 Fall, 2005 2 Wave - Particle Duality •• Particles act like waves and waves act like particles (much more later!) Waves -- waves = oscillating quantities -- "wave" is a fundamental concept in Q.M. (another name for quantum mechanics is "wave mechanics") -- familiar examples include: water, light, sine waves A characteristics of waves A 0 = amplitude
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lecture-09 - Chem111 Fall, 2005 Lecture 9: Introduction to...

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