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| 20080258053 | ALL-MASS MS/MS METHOD AND APPARATUS - A method of obtaining a mass spectrum of elements in a sample is disclosed. Sample precursor ions having a mass to charge ratio M/Z are generated, and fragmented at a dissociation site, so as to produce fragment ions of mass to charge ratio m/z. The fragment ions are guided into an ion trap of the electrostatic or “Orbitrap” type, the fragment ions entering the trap in groups dependent upon the precursor ions M/Z. The mass to charge ratio of each group is determined from the axial movement of ions in the trap. The electric field in the trap is distorted. Ions of the same m/z, that are derived from different pre-cursor ions, are then separated, because the electric field distortion causes the axial movement to become dependent upon factors other than m/z alone. | 10-23-2008 |
| 20090272895 | MASS SPECTROMETER WITH ION STORAGE DEVICE - A method of mass spectrometry having steps of, in a first cycle: storing sample ions in a first ion storage device, the first ion storage device having an exit aperture and a spatially separate ion transport aperture; ejecting the stored ions out of the exit aperture; transporting the ejected ions into an ion selection device which is spatially separated from the said first ion storage device; carrying out ion selection within the spatially separated ion selection device; returning at least some of the ions ejected from the first ion storage device, or their derivatives, back from the spatially separate ion selection device to the first ion storage device, following the step of ion selection; receiving the said returned ions through the ion transport aperture of the first ion storage device; and storing the received ions in the first ion storage device. | 11-05-2009 |
| 20100181475 | ELECTROSTATIC TRAP - An electrostatic trap such as an orbitrap is disclosed, with an electrode structure. An electrostatic trapping field of the form U′(r, φ, z) is generated to trap ions within the trap so that they undergo isochronous oscillations. The trapping field U′(r, φ, z) is the result of a perturbation W to an ideal field U(r, φ, z) which, for example, is hyperlogarithmic in the case of an orbitrap. The perturbation W may be introduced in various ways, such as by distorting the geometry of the trap so that it no longer follows an equipotential of the ideal field U(r, φ, z), or by adding a distortion field (either electric or magnetic). The magnitude of the perturbation is such that at least some of the trapped ions have an absolute phase spread of more than zero but less than 2 π radians over an ion detection period T | 07-22-2010 |
| Patent application number | Description | Published |
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| 20080315080 | Electrostatic Trap - An electrostatic trap such as an orbitrap is disclosed, with an electrode structure. An electrostatic trapping field of the form U′(r,φ,z) is generated to trap ions within the trap so that they undergo isochronous oscillations. The trapping field U′(r, φ,z) is the result of a perturbation W to an ideal field U(r, φ,z) which, for example, is hyperlogarithmic in the case of an orbitrap. The perturbation W may be introduced in various ways, such as by distorting the geometry of the trap so that it no longer follows an equipotential of the ideal field U(r, φ,z), or by adding a distortion field (either electric or magnetic). The magnitude of the perturbation is such that at least some of the trapped ions have an absolute phase spread of more than zero but less than about 2π radians over an ion detection period T | 12-25-2008 |
| 20090206248 | ION ENERGY SPREAD REDUCTION FOR MASS SPECTROMETER - A method for reducing the energy spread of ions over a specific and limited mass to charge ratio range is disclosed, along with an ion deceleration arrangement for implementing such a method. An electric field, having an electric field strength E is generated by a deceleration electrode arrangement ( | 08-20-2009 |
