Conclusions
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1.
The thermionic constants have been measured for the (111) face of a tantalum single crystal: ϕ(111) = 4. 02 ± 0. 02 eV and A0(1−r) = 102 ± 10 A/cm2. deg2.
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2.
A peak is observed on the I(t) curves; at the peak, the work function ϕmin is found to be ϕ(111)Cs = 1. 75 ± 0. 02 eV and the coverage is found to be Θ ≈ 1.
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Literature cited
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii Fizika, No. 6, pp. 143–145, June, 1970.
The authors thank E. P. Sytaya for constant assistance and valuable advice.
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Kamilova, R.Y., Shamsiev, M. Thermionic properties of clean and cesium-covered (111) faces of a tantalum crystal. Soviet Physics Journal 13, 820–822 (1970). https://doi.org/10.1007/BF00836718
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DOI: https://doi.org/10.1007/BF00836718