Mass spectrometer
First Claim
1. A mass spectrometer comprising an ion guide, said ion guide comprising an outer electrode and an inner electrode disposed within said outer electrode, wherein in use said inner and outer electrodes are maintained at a DC potential difference such that ions experience a first radial force towards said inner electrode and wherein in use an AC or RF voltage is applied to said inner and/or said outer electrodes so that ions experience a second radial force towards said outer electrode.
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Accused Products
Abstract
A mass spectrometer is disclosed comprising a guide wire ion guide 1 having an outer cylindrical electrode 2 and an inner guide wire electrode 3. AC and DC potential differences are maintained between the outer electrode 2 and the inner electrode 3 so that ions are radially confined within the ion guide 1 in an annular potential well. The outer electrode 2 may be segmented and axial potential wells created along the length of the ion guide 1 may be translated along the length of the ion guide 1 by applying additional transient DC potentials to the segments forming the outer electrode 2.
38 Citations
96 Claims
- 1. A mass spectrometer comprising an ion guide, said ion guide comprising an outer electrode and an inner electrode disposed within said outer electrode, wherein in use said inner and outer electrodes are maintained at a DC potential difference such that ions experience a first radial force towards said inner electrode and wherein in use an AC or RF voltage is applied to said inner and/or said outer electrodes so that ions experience a second radial force towards said outer electrode.
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81. A mass spectrometer comprising an ion guide, said ion guide comprising a guide wire, cylindrical or rod electrode and an outer cylindrical electrode wherein, in use, both an AC and a DC potential difference is maintained between said guide wire, cylindrical or rod electrode and said outer cylindrical electrode.
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82. A method of mass spectrometry, comprising:
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guiding ions along an ion guide comprising an outer electrode and an inner electrode disposed within said outer electrode; maintaining said inner and outer electrodes at a DC potential difference such that ions experience a first radial force towards said inner electrode; and applying an AC or RF voltage to said inner and/or said outer electrodes so that ions experience a second radial force towards said outer electrode.
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83. A mass spectrometer comprising:
an ion guide comprising a guide wire held centrally in an electrically conductive cylindrical tube electrode wherein both AC and DC voltages are applied, in use, between the guide wire and the cylindrical tube electrode in order to radially retain ions whilst said ions are being transported axially through said ion guide. - View Dependent Claims (84)
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85. A mass spectrometer comprising:
an ion guide comprising a guide wire held centrally in a plurality of outer concentric cylindrical electrodes wherein both AC and DC voltages are applied, in use, between the guide wire and the plurality of outer concentric cylindrical electrodes in order to radially retain ions whilst said ions are being transported axially through said ion guide. - View Dependent Claims (86, 87)
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88. A mass spectrometer comprising:
an ion guide comprising a guide wire held centrally in an electrically conductive cylindrical tube electrode wherein both AC and DC voltages are applied, in use, between the guide wire and the cylindrical tube electrode and wherein ions are arranged, in use, to impact the inside wall of said cylindrical tube electrode or the guide wire to produce secondary ion disassociation by adjusting the AC or DC voltages.
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89. A mass spectrometer comprising:
an ion guide comprising a guide wire held centrally in an electrically conductive cylindrical tube electrode wherein both AC and DC voltages are applied, in use, between the guide wire and the cylindrical tube electrode and wherein said AC voltage or said DC voltage is adjusted so as to cause an increase in the internal energy of ions within said ion guide thereby inducing collisional fragmentation or collisional induced disassociation of said ions.
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90. A mass spectrometer comprising:
an ion guide comprising an inner cylindrical electrode held centrally in an electrically conductive cylindrical tube electrode wherein both AC and DC voltages are applied, in use, between the inner cylindrical electrode and the cylindrical tube electrode in order to radially retain ions whilst said ions are being transported axially through said ion guide.
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91. A mass spectrometer comprising:
an ion guide comprising a guide wire held centrally in an electrically conductive cylindrical tube electrode wherein both AC and DC voltages are applied, in use, between the guide wire and the cylindrical tube electrode in order to radially retain ions whilst said ions are being transported axially through said ion guide and wherein said guide wire splits into two or more wires. - View Dependent Claims (92)
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93. A mass spectrometer comprising:
an ion guide comprising a guide wire held centrally in an electrically conductive cylindrical tube electrode wherein both AC and DC voltages are applied, in use, between the guide wire and the cylindrical tube electrode in order to radially retain ions whilst said ions are being transported axially through said ion guide and wherein said guide wire is not straight. - View Dependent Claims (94)
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95. A mass spectrometer comprising an ion guide, said ion guide comprising a Y-shaped outer cylindrical electrode and a Y-shaped inner guide wire electrode, wherein in use said outer electrode and said inner electrode are supplied with both an AC voltage and a DC voltage and wherein said ion guide is arranged so that an ion beam is split or ion beams are joined.
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96. A mass spectrometer comprising:
an ion guide comprising a guide wire held centrally in an electrically conductive cylindrical tube electrode wherein both AC and DC voltages are applied, in use, between the guide wire and the cylindrical tube electrode in order to radially retain ions whilst said ions are being transported axially through said ion guide, said ion guide further comprising a ring lens, plate or grid and wherein an additional DC or AC voltage is applied, in use, to said ring lens, plate or grid so that ions are reflected backwards and are trapped or stored within said ion guide.
Specification