| 摘要 |
A molecular beam source for a molecular beam tube frequency standard using a barium oxide molecule of the form Ba138016 having spinless atoms and using electrostatic state selection, which source includes 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.
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