Abstract
Surface ionization of atomic beams of strontium or calcium from the [110] and the [111] directions of tungsten was studied mass-spectrometrically. Results consistent with the Saha—Langmuir relation indicate that the method is applicable for the determination of first ionization potentials or work functions. A value for the work function of the [110] direction is 5.41±0.04 eV. A value for the [111] direction of tungsten is 4.49±0.04 eV.

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