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US 8,134,123 B2Granted
Mass spectrometer
AssigneeShimadzu Corporation
InventorsMasaru Nishiguchi, Yoshihiro Ueno, Daisuke Okumura, Hiroto Itoi
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AssigneeShimadzu Corporation
InventorsMasaru Nishiguchi, Yoshihiro Ueno, Daisuke Okumura, Hiroto Itoi
Estimating the term…
One virtual rod electrode is composed by a plurality of electrode plane plates arranged in the ion optical axis direction, and four virtual rod electrodes are arranged around the ion optical axis to form a virtual quadrupole rod type ion transport optical system (30). In one virtual rod electrode, the interval between the adjacent electrode plane plates is set to be large in the anterior area (30A) and small in the posterior area (30B). As the interval between electrodes becomes larger, high-order multipole field components increase and therefore the ion acceptance is increased, which enables an efficient acceptance of ions coming from the previous stage. On the other hand, if the interval between electrodes is small, the quadrupole field components relatively increase and the ion beam's convergence is improved. Therefore, ions can be effectively introduced into a quadrupole mass filter for example in the subsequent stage, which contributes to the enhancement of the mass analysis' sensitivity and accuracy.
A mass spectrometer including a virtual multipole rod type ion transport optical system in which 2N (where N is an integer equal to or more than two) virtual rod electrodes are placed in such a manner as to surround an ion optical axis, each of the virtual rod electrodes being composed of M (where M is an integer equal to or more than two) electrode plane plates separated from each other in the ion optical axis direction, wherein:
A mass spectrometer including a virtual multipole rod type ion transport optical system in which 2N (where N is an integer equal to or more than two) virtual rod electrodes are placed in such a manner as to surround an ion optical axis, each of the virtual rod electrodes being composed of M (where M is an integer equal to or more than two) electrode plane plates separated from each other in the ion optical axis direction, wherein:
A mass spectrometer including a virtual multipole rod type ion transport optical system in which 2N (where N is an integer equal to or more than two) virtual rod electrodes are placed in such a manner as to surround an ion optical axis, each of the virtual rod electrodes being composed of M (where M is an integer equal to or more than two) electrode plane plates separated from each other in the ion optical axis direction, wherein:
A mass spectrometer including a virtual multipole rod type ion transport optical system in which 2N (where N is an integer equal to or more than two) virtual rod electrodes are placed in such a manner as to surround an ion optical axis, each of the virtual rod electrodes being composed of M (where M is an integer equal to or more than two) electrode plane plates separated from each other in the ion optical axis direction, wherein:
Dependencies are inferred from the claim text.