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Preliminary contact potential difference measurements are reported between aged polycrystalline tungsten foil and a polished single-crystal disk oriented with a surface normal, within ½°, to the [110] direction. A contact potential difference of 0·50 ± 0·02 V was observed, leading to a work function of 5·05 ± 0·02 eV for the (110) oriented surface.
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Hopkins et al. (1966) studied this question.
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