| 摘要 |
An ion source for mass spectrometers including an ionization chamber having an aperture for the passage of ions and an electrode disposed therein, electron generating means for directing a beam of electrons toward the electrode, means for introducing a sample into the chamber, and source means for developing an electrical signal having a value greater than the value of a signal applied to an electron source and less than the value of a signal necessary to cause substantial field ionization. Also included are circuit means for connecting the source means to the electrode to generate an electrical field about the electrode to rapidly expel ions, developed upon bombardment of the sample by the electrons, through the aperture. |
