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The Hall mobility of electrons in CdS platelets has been measured at 230^∘{}K as a function of the electric field using stationary cathode-adjacent high-field domains in the range of negative differential conductivity. The electron mobility is observed to be field-independent up to 30 kV/cm. Above 30 kV/cm it decreases linearly with the field from its low-field value of about 620 cm²/V sec, to about 300 cm²/V sec at 70 kV/cm, indicating scattering of hot electrons with optical phonons.
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Böer et al. (1968) studied this question.
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