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A pseudopotential formalism is applied to calculate the angular correlation of positron annihilation radiations (ACPAR) along the (100), (110) and (111) directions in Ge. The results are found to agree very well with the measured data. Calculations show that the ACPAR line shapes, particularly in the low-momentum region, are very much influenced by the detailed nature of bonding. Two-photon autocorrelation functions corresponding to the above symmetry directions are also presented and some interesting conclusions are drawn regarding positron-electron many-body correlation effects.
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Panda et al. (1993) studied this question.
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