lecture_15_07b

lecture_15_07b - 05/13/09 Physics 13 - Fall 07 - G.R....

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Unformatted text preview: 05/13/09 Physics 13 - Fall 07 - G.R. Goldstein 1 Announcements No class Thursday. Make up will be arranged. Read Krane, Chapters 8 & 9 Homework 5 due Tuesday, Nov.6 Exam 2 Thursday Nov.15 Will cover molecules, solids, nuclei, particles and cosmology in remaining weeks - survey of topics that are calculable Applying Quantum Mechanics & Relativity 05/13/09 Physics 13 - Fall 07 - G.R. Goldstein 2 Some element properties E ion vs. Z depends on difficulty in removing outermost, valence electron Peaks at Z=2, 10, 18, 36, 54 Inert gases or 1s, 2s2p, 3s3p, 4s4p3d, 4d5s5p Valleys for alkali metals Atomic radii vs.Z varies oppositely for valence e Electrical resistivity vs. Z (low for s 1 atoms) Magnetic susceptability M = B (~ L & S ) Paramagnetic >0, diamagnetic <0, ferromagnetic 05/13/09 Physics 13 - Fall 07 - G.R. Goldstein 3 Spectra E i- E f = hf l = 1, m l = or 1 ~ Optical for outer selection rules valence electron & j = 1 or 0 transitions (E =1.8-3 eV) j= 0 not Doublets due to L S splittings e.g. 11 Na: 3p( 2 P 1/2 ) 3s( 2 S 1/2 ) =589.59 nm 3p( 2 P 3/2 ) 3s( 2 S 1/2 ) =588.99 nm single valence e- outside closed (n=2) 05/13/09 Physics 13 - Fall 07 - G.R. Goldstein 4 X-Ray spectra E = several keV e- drops to vacancy in K or L shell E n 2245-[(Z-1) 2 /n 2 ] 13.6 eV especially for n=1 or 2 e.g. K shell e- knocked out of atom....
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lecture_15_07b - 05/13/09 Physics 13 - Fall 07 - G.R....

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