Ion injection device for a time-of-flight mass spectrometer
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United States of America Patent
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Aug 23, 2016
Grant Date -
Dec 24, 2015
app pub date -
Jun 19, 2014
filing date -
Jun 19, 2014
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Abstract
The invention provides methods and devices to pulse ions from an RF ion storage into the flight tube of a time-of-flight mass spectrometer. The pusher cell comprises essentially two parallel plates, both plates completely slotted into two electrically insulated halves. The four half plates can be supplied with RF voltages to form a two-dimensional quadrupole field in the center between the slits, or with DC voltages to form a homogeneous acceleration field to eject ions. The RF quadrupole field is not ideal, but sufficiently good to store ions, to damp the ions by an additional collision gas, and to form a fine thread of ions in the axis of the quadrupole field. The DC acceleration field is extremely homogeneous; slight distortions near the slits can be corrected by external electrodes. The ideal acceleration field results in a high mass resolution and the device does not show any mass discrimination.
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