In this paper we present the results of an investigation of the radiative recombination of excitons bound to neutral S; Se, and Te donors in GaP in external magnetic fields of up to 16.5 T and, in one case, 18 T. The complete set of spectroscopic g values for the initial bound exciton and the final donor state and the different diamagnetic effects are evaluated for all three donors. This is the first report of diamagnetic effects in GaP. A diamagnetic shift and a splitting are observed, both anomalously small. A small tendency for an increase in the' diamagnetic coefficients of the principal bound-exciton transition which leaves the donor in its ground state and a more dramatic increase for transitions to donor excited states with increasing quantum number are established. It is suggested that the principal two-electron lines all involve transitions to the s(A l ) donor excited states. This new identification provides a more plausible position of the series limit E"ofthe donor than hitherto. The electronic g, value of the donor turns out to be equal to 2.00, independent of the chemical nature of the donor. This value agrees with the value derived from ESR experiments. A recent supposition, that in general there might be a difference between luminescence and ESR g, values is disproved. The isotropic hole g value is observed to decrease with increasing localization of the hole due to changes in the impurity central cell potential. These effects are given a detailed interpretation in the following paper.
Cadmium telluride has long been recognised a s an almost ideal material in which to study polaron coupling phenomena in the magneto-optical spectra of hydro- We report measurements in the near infra-red ( -1 . 6 eV) on the high-field magneto-optical properties of the two-electron lines of the donor photoluminescence spectrum. These a r e due to recombination of neutral donor bound.excitons which leave the donor in excited states ( 2 ) , l ) those same states which were subjects of earlier studies by f a r infra-red absorption (1), (3). We have been ahle to approach the pinning energy corresponding to the resonance of the 1s-2p transition with the LO phonon more closely than hitherto. Strong emission bands due to phonon assisted free exciton recombination obscure part of the region of interest, a feature which could be avoided by direct excitation of donor bound excitons by a tunable laser.
+Our measurements were taken photographically at fields up to 125 kG, frequently at intervals of 1 kG o r less. The positions of the luminescence lines are shown in Fig. l a . The intensities of many of the lines, particularly those associated with the phonon replication, a r e P 0 . 1 % of the intensity of the principal donor bound exciton recombination line (not shown). The latter is accompanied by a number of lines due to excited states of the bound exciton which add appreciable complication t o the two-electron spectrum (2). 1) Reference (2) describes the Zeeman effect in the two-electron lines at magnetic fields below 50 kG.
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