Mass spectrometer
AssigneeHitachi High-Technologies Corporation
InventorsYuichiro Hashimoto, Hideki Hasegawa, Masuyuki Sugiyama
Life of this patent
Estimating the term…
Abstract
The mass spectrometer is characterized in that a linear ion trap, that consists of electrodes for mass-selective discharge, is provided with a mechanism that excites ions in a first direction that is perpendicular to the rod axes and a mechanism that simultaneously generates an electric field on the axes in a second direction that is perpendicular to the axial direction and the first direction in order to generate an electric field on the central axis. Highly efficient, high-speed scanning can be achieved using this configuration.
Claims13
A mass spectrometry apparatus comprising:
- in a linear ion trap constructed of a plurality of quadrupole rod electrodes for performing mass-selective ejection,
- means for exciting ions along a first direction which orthogonally intersects a center axis of said rod electrodes;
- and
- means for forming an on-axis electric field along a second direction which orthogonally intersects the center axis of said rod electrodes and the first direction,
- wherein said first direction is a direction which connects a center of said quadrupole rod electrodes to an intermediate position of adjoining rod electrodes of said quadrupole rod electrodes, and
- wherein said means for forming the on-axis electric field along the second direction is means in which a direct current (DC) voltage is applied to a plurality of vane electrodes which are inserted between one pair of the adjoining rod electrodes of said quadrupole rod electrodes and whose distances from a center of said quadrupole rod electrodes vary.
A mass spectrometry apparatus comprising:
- an ion source;
- a linear ion trap constructed of a plurality of quadrupole rod electrodes for mass-selectively ejecting ions introduced from said ion source;
- and
- a detector for detecting the ions ejected from said linear ion trap;
- wherein:
- said linear ion trap is comprised of:
- means for exciting ions along a first direction which orthogonally intersects a center axis of said rod electrodes;
- means for forming an on-axis electric field along a second direction which orthogonally intersects the center axis of said rod electrodes and the first direction;
- wherein said first direction is a direction which connects a center of said quadrupole rod electrodes to an intermediate position of adjoining rod electrodes of said quadrupole rod electrodes, and
- wherein said means for forming the on-axis electric field along the second direction is means in which a direct current (DC) voltage is applied to a plurality of vane electrodes which are inserted between one pair of the adjoining rod electrodes of said quadrupole rod electrodes and whose distances from a center of said quadrupole rod electrodes vary.
A mass spectrometry method with employment of a linear ion trap constructed of a plurality of quadrupole rod electrodes, comprising:
- a step for introducing ions to said linear ion trap;
- a step for accumulating the introduced ions in said linear ion trap;
- a step for exciting the accumulated ions along a first direction which connects a center of said quadrupole rod electrodes to an intermediate position of adjoining rod electrodes of said quadrupole rod electrodes;
- and
- a step for forming an electric field along an axial direction of said quadrupole rod electrodes, and for converging the ions to a portion of said linear ion trap;
- wherein:
- mass-selective ejection of the ions is performed so as to detect ions;
- and
- wherein said first direction is a direction which connects a center of said quadrupole rod electrodes to an intermediate position of adjoining rod electrodes of said quadrupole rod electrodes, and
- wherein said step for forming the electric field includes applying a direct current (DC) voltage to a plurality of vane electrodes which are inserted between one pair of the adjoining rod electrodes of said quadrupole rod electrodes and whose distances from a center of said quadrupole rod electrodes vary.
Dependencies are inferred from the claim text.