## Proceedings of the International School of Physics "Enrico Fermi.", Volume 22N. Zanichelli, 1963 - Nuclear physics |

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Page 180

A theoretical

by Wolfe [6] and is of the form (1.28) a, = a„ = const exp hco0e, where e, is the

ionization energy, 10 a mean free path and fico0 the energy of an optical phonon.

A theoretical

**expression**for a has been obtained for a spherical energy surfaceby Wolfe [6] and is of the form (1.28) a, = a„ = const exp hco0e, where e, is the

ionization energy, 10 a mean free path and fico0 the energy of an optical phonon.

Page 261

The x, in the

to the principal axes of the ellipsoid and the m, are the components of the mass

tensor in the ellipsoid system. We have previously obtained the energy levels [eq.

The x, in the

**expression**are the direction cosines of the magnetic field H relativeto the principal axes of the ellipsoid and the m, are the components of the mass

tensor in the ellipsoid system. We have previously obtained the energy levels [eq.

Page 485

For k close to the edge, S is small and terms in 8 can be neglected giving us our

This is the group of states for which our effective mass approximation is valid.

For k close to the edge, S is small and terms in 8 can be neglected giving us our

**expression**for the effective mass for a group of states close to the band edge.This is the group of states for which our effective mass approximation is valid.

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absorption acceptor approximation assumed band edge band structure Brillouin zone calculated carrier centre charge Chem coefficient components compound concentration conduction band consider constant corresponding crystal curves cyclotron resonance degenerate density diffusion direct transition discussed donor doping effective mass electric field energy gap energy surfaces equation equilibrium example exciton experimental expression Faraday rotation foreign atoms free electron frequency germanium given hence holes imperfections impurity indium antimonide InSb interaction interband ionization ions Journ lattice levels linear liquid magnetic field matrix measurements melt mobility momentum obtained optical p-type phonon Phys potential pressure quantum range reciprocal lattice region samples scattering semiconductors shown in Fig spherical spin spin-orbit structure elements symmetry tensor theory thermodynamic thermodynamic potentials tion transverse valence band valley Voigt effect wave functions wave vector Zeeman effect zero zone