Ion guide with orthogonal sampling
First Claim
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1. A mass spectrometer comprising:
- an RF ion guide comprising a plurality of electrodes wherein in a mode of operation ions are orthogonally sampled from said ion guide and wherein said ions are not axially trapped or otherwise axially confined within said RF ion guide;
a device arranged and adapted to apply an AC or RF voltage to said electrodes in order to confine ions within said ion guide;
a device arranged and adapted to apply a DC potential to at least some of said electrodes; and
a control system, wherein said control system is arranged and adapted to switch said ion guide to operate in a mode of operation wherein said DC potential is applied in order to cause ions to be orthogonally sampled from a portion of said ion guide.
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Abstract
A mass spectrometer is disclosed comprising a RF ion guide wherein in a mode of operation a continuous, quasi-continuous or pulsed beam of ions is orthogonally sampled from the ion guide and wherein the continuous, quasi-continuous or pulsed beam of ions is not axially trapped or otherwise axially confined within the RF ion guide. The ion guide is maintained, in use, at a pressure selected from the group consisting of: (i) 0.0001-0.001 mbar; (ii) 0.001-0.01 mbar; (iii) 0.01-0.1 mbar; (iv) 0.1-1 mbar; (v) 1-10 mbar; (vi) 10-100 mbar; and (vii) >100 mbar.
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Citations
23 Claims
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1. A mass spectrometer comprising:
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an RF ion guide comprising a plurality of electrodes wherein in a mode of operation ions are orthogonally sampled from said ion guide and wherein said ions are not axially trapped or otherwise axially confined within said RF ion guide; a device arranged and adapted to apply an AC or RF voltage to said electrodes in order to confine ions within said ion guide; a device arranged and adapted to apply a DC potential to at least some of said electrodes; and a control system, wherein said control system is arranged and adapted to switch said ion guide to operate in a mode of operation wherein said DC potential is applied in order to cause ions to be orthogonally sampled from a portion of said ion guide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of mass spectrometry conducted with an RF ion guide comprising a plurality of electrodes, said method comprising:
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passing ions through said RF ion guide, wherein said ions are not axially trapped or otherwise axially confined within said RF ion guide; applying an AC or RF voltage to said electrodes in order to confine ions within said RF ion guide; and orthogonally sampling said ions from a portion of said RF ion guide in a mode of operation by applying a DC potential to at least some of said electrodes.
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Specification