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

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Page 513

involving emission of a phonon, when hv > AE + Ev, and as (hv — AE+Ev)* for

transitions involving

usual the forbidden energy gap and Ev the phonon energy equal to hco(q). Here

q is ...

involving emission of a phonon, when hv > AE + Ev, and as (hv — AE+Ev)* for

transitions involving

**absorption**of a phonon, when hv > AE — Ev, AE being asusual the forbidden energy gap and Ev the phonon energy equal to hco(q). Here

q is ...

Page 531

The phenomena studied are usually: 1)

photoconductivity, 4) emission. Measurement of optical

band of wavelengths is the most direct way of obtaining information about the

forbidden energy ...

The phenomena studied are usually: 1)

**absorption**, 2) reflection, 3)photoconductivity, 4) emission. Measurement of optical

**absorption**over a wideband of wavelengths is the most direct way of obtaining information about the

forbidden energy ...

Page 537

excitation of electrons in impurity centres. For example, an electron in a donor

state may be raised from the lowest state to an excited state or to the conduction

band.

**Absorption**due to impurity centres.**Absorption**may also take place due toexcitation of electrons in impurity centres. For example, an electron in a donor

state may be raised from the lowest state to an excited state or to the conduction

band.

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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