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一吸附在超高真空技术中的意义近代科学的发展要求高水平的实验技术,超高真空技术即是其中之一。近十余年来,尽管超高真空技术有了很大的发展,但许多基本问题(如各种抽气泵的抽气机构、超高真空的准确测量等)仍未解决。分析已经发表的资料,可以看出,这些问题的最后解决在很大程度上取决于对吸附现象的进一步了解和掌握。超高真空是指气压低于10~(-8)毫米汞的真空。在超高真空中,气体分子的自由程极长(>5×10~3米),因此气体分子的相互碰撞完全可以忽略,而主要是气体分子与系统中各种表面的碰撞。通常气体分子撞上表面之后总多少会在表面上滞留一定时间,吸附就是
A adsorption in the ultra-high vacuum technology significance The development of modern science requires a high level of experimental technology, ultra-high vacuum technology is one of them. In recent ten years, despite the great development of ultrahigh vacuum technology, many basic problems (such as the suction mechanism of various suction pumps and the accurate measurement of ultrahigh vacuum) have not been solved yet. Analysis of published data shows that the final resolution of these problems depends to a great extent on the further understanding and mastery of adsorption phenomena. Ultra-high vacuum refers to the vacuum pressure is lower than 10 ~ (-8) mm mercury. In the ultra-high vacuum, the free path of the gas molecules is very long (> 5 × 10 ~ 3 meters), so the collision of the gas molecules can be neglected, mainly the collisions of gas molecules with various surfaces in the system. Usually gas molecules hit the surface after the total number will stay on the surface for some time, the adsorption is