472 UNIVERSITY OF FLORIDA PS. 512.-Elements of Quantum Mechanics. 3 hours. 3 credits. Prere- quisite: PS. 320, MS. 421-422. Offered 2. Introduction to the theory of Quantum Mechanics, for students of physics and chemistry. PS. 515.-Physics of the Solid State. 3 hours. 3 credits. Prerequisite: PS. 512. Offered 2. Theoretical interpretation of mechanical, magnetic, electrical, and optical properties of solids. PS. 516.-Advanced Quantum Mechanics. 3 hours. 3 credits. Prerequisite: PS. 512. Not offered 1952-53. Atomic structures, mathematical approximations, advanced collision theory, semi- classical radiation theory, relativistic wave equations, and quantum electrodynamics. PS. 519.-Laboratory Techniques in Nuclear Physics. 3 hours. 1 credit. Prerequisite: PS. 317. Offered 2. Laboratory practice in the theory and use of equipment necessary in the field of nuclear physics. Experiments include the Geiger counter and its applications in the detec- tion of alpha, beta, gamma rays, neutrons, and positrons; the study of radioactivity; coincidence counting; scaling circuits; cosmic ray study; Wilson cloud chamber, the Van de Graaff electrostatic generator; and nuclear reaction. PS. 520.-Theory of Optical Spectra. 3 hours. 3 credits. Prerequisite: PS. 512. Offered 2. Optical spectra of atoms, with emphasis on the interpretation of these spectra in terms of atomic structure. Introduction to the theory of molecular spectra. PS. 521.-Molecular Spectra. 3 hours. 3 credits. Prerequisite: PS. 512, 520. Not offered 1952-53. An introduction to the theory of molecular spectra, treating primarily the case of diatomic molecules. Emphasis is placed on the interpretation of spectra in terms of the physical and chemical properties of the molecular system. PS. 523.-Seminar in Modern Theory. Variable credit. Offered 1, 2, 3. Some particular phase of the most recent developments in theoretical physics is taken up in detail. PS. 525.-Experimental Foundations of Nuclear Physics. 3 hours. 3 cred- its. Prerequisite: PS. 317. Corequisite: PS. 512. Offered 2. The study of the nucleus, nuclear reactions, radioactivity, interaction of radiation with matter, radiation detecting devices, accelerating devices; experimental evidence will be employed as a basis for the discussion. PS. 526.-Theoretical Nuclear Physics. 3 hours. 3 credits. Prerequisite: PS. 525. Offered 1. The application of quantum theory to a study of the nature of nuclear particles including range-energy relations, the deuteron, scattering theory, exchange forces, pair production, and pile theory. PS. 527.-X-Rays. 3 hours. 3 credits. Prerequisite: PS. 512. Offered 1. The classical and quantum mechanical theories of the production of x-rays, and their applications in the determination of crystal structure. The statement "Offered 1" means offered first semester; 2, second semester; 3, summer session.