Abstract
The existing discrepancy between theoretical models and experimental results for hydrogen-donor complexes in crystalline silicon is resolved using first-principles pseudopotential-density-functional calculations for the hydrogen-phosphorus pair. In the configuration which is the global energy minimum, H is located on the extension of a P-Si bond on the Si side, with the Si-H pair relaxing away from P by 0.6 A\r{}, leaving the P atom threefold coordinated. The calculated stretching and wagging vibrational frequencies associated with this configuration are in accord with experiment.
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