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

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Page 21

El is eight times

etc. Consider the (0, 1, 0)-direction (.T to X), along which kx = kx=0; 0<Jfe <1: it is

not necessary to consider negative values of Jcv since E( — k) = = E(k).

El is eight times

**degenerate**(there are eight states with this energy), E2 six times,etc. Consider the (0, 1, 0)-direction (.T to X), along which kx = kx=0; 0<Jfe <1: it is

not necessary to consider negative values of Jcv since E( — k) = = E(k).

Page 34

Our original level at k = 0, which was 48 times

approximation, splits then, as a consequence of the rotation symmetry of the

crystal, into one r, state, nondegenerate; three I\ states, each triply

two rd ...

Our original level at k = 0, which was 48 times

**degenerate**in the free electronapproximation, splits then, as a consequence of the rotation symmetry of the

crystal, into one r, state, nondegenerate; three I\ states, each triply

**degenerate**;two rd ...

Page 319

These transitions, which occur at energies well below the energy gap, can be

seen since they are not masked out by the stronger direct allowed or indirect

transitions. The theory can be extended to the case of

semiconductors by ...

These transitions, which occur at energies well below the energy gap, can be

seen since they are not masked out by the stronger direct allowed or indirect

transitions. The theory can be extended to the case of

**degenerate**semiconductors by ...

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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