QUADRUPOLE MASS SPECTROMETRY APPARATUS
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United States of America Patent
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Issued Date -
Aug 13, 2015
app pub date -
Feb 12, 2014
filing date -
Feb 12, 2014
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A quadrupole mass spectrometry apparatus including a quadrupole power supply unit, in which the frequency of the high frequency voltage produced by a high frequency power supply is made switchable, and variable capacitors are provided in parallel with the floating capacitance of a quadrupole mass filter. In a high sensitivity mode which prioritizes sensitivity, the frequency of the high frequency voltage is made higher than in a high mass mode which prioritizes width of mass range, and the capacitance values of variable capacitors are increased. Increasing the capacitance value forming an LC resonant circuit causes the frequency based on the LC resonance conditions to rise, making it possible to cause LC resonance of the high frequency voltage with a higher frequency and to increase the amplitude thereof.
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