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

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Page 333

This gives validity to the claims of Elliott and Loudon [9] and also to Howard and

Hasegawa [10] that transitions here and in the

localized states because of the Coulomb attraction. 3. -

This gives validity to the claims of Elliott and Loudon [9] and also to Howard and

Hasegawa [10] that transitions here and in the

**exciton**case are greater tolocalized states because of the Coulomb attraction. 3. -

**Excitons**. 31. Direct**exciton**in ...Page 334

One of the

linear extrapolation to zero field. Nevertheless, from the value of the reduced

effective mass, we can estimate the binding energy to be x\ n*m0 13.6 x 0.033 e"

~W~ ...

One of the

**exciton**lines at zero field lies above the convergence point of thelinear extrapolation to zero field. Nevertheless, from the value of the reduced

effective mass, we can estimate the binding energy to be x\ n*m0 13.6 x 0.033 e"

~W~ ...

Page 428

However, most of the results indicate that the primary process is absorption in the

fundamental, with a second process producing the carriers. The

produced in the absorption is able to diffuse through the crystal, and since the

photon ...

However, most of the results indicate that the primary process is absorption in the

fundamental, with a second process producing the carriers. The

**exciton**produced in the absorption is able to diffuse through the crystal, and since the

photon ...

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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