复铼膜阴极的发射和表面特性
EMISSION AND SURFACE CHARACTERISTICS OF A DISPENSER CATHODE COATED WITH RHENIUM
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摘要: 本文报道了复铼膜扩散阴极的发射和表面特性的研究结果,并与S-型阴极进行了比较。实验结果表明:S-型阴极复铼膜后,其热电子发射明显提高,且分布均匀。月极表面上主要元素的俄歇像显示Ba在复铼膜阴极表面上的分布要比在S-型阴极表面上均匀得多,Ba的低能Auger谱和XPS的研究表明:与S-型阴极相比Ba在复铼膜阴极表面上呈现更强的金属特性。这可能是S-型阴极复铼膜后发射增大的主要原因。Abstract: The emission and surface characteristics of a dispenser cathode coaled with Re are studied. It is found that the dispenser cathode coated with Re has both higher current density and more uniform distribution of emission than the S type cathode. The Auger images of Ba show tha: the Ba distribution on the surface of the cathode coated with Re is more uniform than that on the surface of the S type cathode. The analytical results by XPS and low energy AES show that the Ba on the surface of the cathode coated with Re has stronger metallic property than thar on the surface of the S type cathode.
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P.Zalm. A. J. A. Van Stratum,Philips Tech. Rev., 27(1966) 3/4,69-76.[2]A.H. Beck, De-An Wang, Int.J. Electronics,51(1981) 6, 717-733.[3]G.A. Haas, C. R. K. Marrian, A.Shih, Applications of surface Science, 16(1983)1/2, 106-124. -
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