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用自制的SXAPS及XPS与AES技术对S型与M型钡钨阴极进行了研究。结果表明,这两类阴极表面化学结构特性存在明显的差别。M阴极激活后,存在钡的单原子层与氧的吸附;而S阴极激活后,钡与氧化钡并存。引进新的俄歇参量a_2,可以表征包括钡钨阴极在内的钡的各种化学态。M阴极表面不仅有O_s与Ru,也有W扩散出来。模拟试验表明,SXAPS轰击电流对阴极无明显的破坏作用。
S-type and M-type barium tungsten cathodes were studied by self-made SXAPS, XPS and AES techniques. The results show that there are obvious differences between the chemical structure of the two types of cathode surface. M cathode activation, the presence of barium single atomic layer and oxygen adsorption; and S cathode activation, barium and barium oxide co-exist. The introduction of new Auger parameters a_2, can be characterized, including barium tungsten cathode, including a variety of barium chemical state. M cathode surface not only O_s and Ru, but also W diffused out. Simulation tests show that SXAPS bombardment current has no obvious damage to the cathode.