Solutions of the effective-particle model

The continuum or effective-mass limit and the hydrogenic solutions of eqn (6.19) are described in Appendix E. As the continuum limit analysis remains qualitatively correct for a discrete lattice, it is useful to summarize them here before discussing the general solutions. 

3 shows the excitation energies of the two lowest singlet and triplet states, and the charge gap, while Fig. 6.4 shows the exciton probability density, V n( )- 

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