Molecular frequency standard |
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| 申请号 | US3578968D | 申请日 | 1968-04-16 | 公开(公告)号 | US3578968A | 公开(公告)日 | 1971-05-18 |
| 申请人 | HELMUT W HELLWIG; | 发明人 | HELLWIG HELMUT W; | ||||
| 摘要 | A molecular beam tube frequency standard using a barium oxide molecule of the form Ba138016 having spinless atoms and using electrostatic state selection. The beam tube comprises a beam source including a thin-walled refractory electrically conductive oven tube containing Ba138016. The oven tube, which is chemically inert to barium oxide, is surrounded by a thermionic electron emitter which is made negative with respect to the oven tube. Electrons emitted from the electron emitter bombard the oven tube and heat the barium oxide to a temperature at which Ba138016 molecules are evaporated. The beam tube also comprises a cavity resonator supporting a TM mode which includes a cylinder and two end pieces provided with apertures for passage of the beam. Each of the ends of the cylinder is provided with a barbed edge; a flat surface of each end piece is pressed against a corresponding barbed edge of the cylinder by mounting means so that the barbed edges cut slightly into the surface of the end pieces. The beam tube also includes a detector comprising a heated elongated member stretched along the axis of the beam tube and arranged to intercept beam particles over a focal region extending along a portion of the length of the said member. Ions are formed in the vicinity of the elongated member and are collected by electrode means maintained negative with respect to said member. | ||||||
| 权利要求 | 2. A molecular beam tube frequency standard according to claim 1 wherein said state selectors are electrostatic. |
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| 说明书全文 | |||||||
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