Abstract
In the present work it has been shown that the discrepancy between Kwok's theory and the observed temperature dependence of acoustic-phonon attenuation in P-doped Ge beyond its maximum can be partially explained if one modifies Kwok's theory to include the transitions to singlet and triplet states from higher-energy states which may be relevant at higher temperatures. This work confirms that Kwok's theory overestimates phonon attenuation in the higher-temperature region.
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