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    • 5. 发明授权
    • Method of refining rare gas halide excimer laser gas
    • 精炼稀有卤化物准分子激光气体的方法
    • US4740982A
    • 1988-04-26
    • US909702
    • 1986-09-22
    • Kohzo HakutaMinoru AramakiTakashi Suenaga
    • Kohzo HakutaMinoru AramakiTakashi Suenaga
    • H01S3/036H01S3/225H01S3/22
    • H01S3/225H01S3/036
    • A laser gas used in a rare gas halide excimer laser is efficiently refined with little loss of the essential rare gas such as Kr, Ar or Xe by contact of the laser gas with a solid alkaline compound, e.g. Ca(OH).sub.2, for conversion of acidic impurities and also the halogen source gas such as F.sub.2 or HCl into solid metal halides and contact of the remaining gas with zeolite which is adsorbent of the remaining impurities. When the halogen source gas comprises a highly oxidizing fluorine matter the laser gas is first brought into contact with a reactive metal, e.g. Si or Fe, to convert the oxidizing fluorine matter into metal fluorides to thereby prevent formation of O.sub.2, which is obstructive to the laser operation, by reaction of the oxidizing matter with the alkaline compound. The halogen source gas too can be recovered by initially cooling the laser gas so as to cause condensation of the rare gas and impurities having relatively high boiling points and leave the halogen source gas, which is lower in boiling point, in gas phase.
    • 在稀有气体卤化物准分子激光器中使用的激光气体通过激光气体与固体碱性化合物的接触,如Kr,Ar或Xe等几乎不损失基本稀有气体而被有效地精炼。 Ca(OH)2,用于将酸性杂质以及卤素源气体如F2或HCl转化成固体金属卤化物,并将剩余气体与作为其余杂质的吸附剂的沸石接触。 当卤素源气体包含高度氧化的氟物质时,激光气体首先与反应性金属接触,例如, Si或Fe,将氧化性氟物质转化为金属氟化物,由此氧化物质与碱性化合物的反应,可以防止形成对激光作业产生阻碍的O 2。 卤素源气体也可以通过初始冷却激光气体来回收,以使稀有气体和沸点相对较高的杂质冷凝,并且在气相中留下沸点较低的卤素源气体。