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Quadrupole ionization gauge.

Nonmagnetic ionization gage consisting of quadrupole lens systems excited at HF, discussing electron focusing during operation

Schwarz, H.↗

Quadrupole ionization gage measures ultrahigh vacuum

Quadrupole system, energized with a 200 MHz electric field, restrains ionizing electrons within the center of the ionization gage. Oscillatory trajectory of the electrons increases the probability of ionizing the gas molecules, lowers background X-ray level, and increases the signal-to-noise ratio.

Schwarz, H. J.↗