Improvements in electrodes and in instrumentation allow measurement of Hall mobilities as low as 1 cm2/V·sec in photoconducting insulators. Resistance strip electrodes are replaced by parallel wire electrostatic potential dividers. Pulsed photocurrents resulting from electric fields of alternating polarity are averaged in a dual channel ``boxcar.'' This signal is then averaged over multiple field sweeps of alternating polarity by a small digital computer.
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Graham C. Smith (1969) studied this question.
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