## Introduction to Solid State Physics |

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Page 504

18

relate to optical phenomena in nonmetallic crystals. We have already seen that

an electron-hole pair is produced when photons of energy greater than the

energy ...

18

**Excitons**, Photoconductivity, and Luminescence The subjects of this chapterrelate to optical phenomena in nonmetallic crystals. We have already seen that

an electron-hole pair is produced when photons of energy greater than the

energy ...

Page 505

If e is independent of r the potential is just the Coulomb potential reduced by the

dielectric constant, and there will n = 3n = 2-T A }

gap Fig. 18.1. Energy levels of an

...

If e is independent of r the potential is just the Coulomb potential reduced by the

dielectric constant, and there will n = 3n = 2-T A }

**Exciton**levels n = 1– Energygap Fig. 18.1. Energy levels of an

**exciton**whose center of mass is at rest. Optical...

Page 506

If the energy surfaces are not spherical and nondegenerate the

is considerably more complicated, but there is little doubt that bound

states” exist for quite general energy surfaces. The

...

If the energy surfaces are not spherical and nondegenerate the

**exciton**problemis considerably more complicated, but there is little doubt that bound

**exciton**states” exist for quite general energy surfaces. The

**exciton**ground state energy is...

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absorption acceptors alkali alloys approximately atoms axis barium titanate boundary Bragg Brillouin zone calculated chapter charge conduction band conduction electrons crystal structure cube cubic Curie point Debye density dielectric constant diffraction diffusion dipole direction discussion dislocation distribution domain effective mass elastic electric field energy equation equilibrium exciton experimental F centers factor Fermi ferroelectric ferromagnetic free electron frequency germanium given heat capacity hexagonal holes impurity interaction ionization ions lattice constant lattice point low temperatures magnetic field magnetic moment metals molecules motion nearest neighbor normal observed p-n junction paramagnetic particles phonons Phys physics plane polarizability polarization positive potential Proc region resonance result room temperature rotation semiconductor Shockley shown in Fig sodium chloride solid solution space group specimen spin superconducting surface susceptibility symmetry Table theory thermal tion transition unit volume vacancies valence band values vector velocity wave functions wavelength zero