发明名称 |
Electron reversal ionizer for detection of trace species using a spherical cathode |
摘要 |
A reversal electron, high-current ionizer capable of focusing a beam of electrons to a reversal region employs an indirectly heated cathode having a concave emitting surface of width W<2r, where r is the radius of curvature and preferably a ratio of width to radius approximately equal to one for optimum high current for a given cathode width.
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申请公布号 |
US5374828(A) |
申请公布日期 |
1994.12.20 |
申请号 |
US19930127653 |
申请日期 |
1993.09.15 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION |
发明人 |
BOUMSELLEK, SAID;CHUTJIAN, ARA |
分类号 |
H01J49/04;H01J49/14;(IPC1-7):H01J37/08;H01J49/00;B01D59/44 |
主分类号 |
H01J49/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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