Abstract: A method for driving a linear ion trap having rod electrodes arranged so as to surround a central axis includes: an ion-introducing step for introducing ions into an ion-capturing space surrounded by the rod electrodes, and for capturing the ions by a multipole RF electric field created within the ion-capturing space; and an ion-ejecting step for creating both a DC electric field for ion extraction extending from an external area outside the ion-capturing space into the ion-capturing space through a space between two predetermined rod electrodes neighboring each other around the central axis among the plurality of rod electrodes and the multipole RF electric field, and for sequentially ejecting ions according to their m/z from the ion-capturing space toward the external area through the space between the two predetermined rod electrodes by changing at least one of the multipole RF electric field and the DC electric field.

Abstract: An ion transport optical system includes N rod electrodes forming an N-pole arrangement externally tangent to a circle of diameter A1 at an ion-entrance end, where N is an even number not smaller than six. Four electrodes form a quadrupole arrangement externally tangent to a circle of diameter A2 at an ion-exit end, where A2<A1. At least two of them are arranged obliquely to the central axis of the N-pole or quadrupole arrangement. At least four of the N electrodes are shaped such that the cross-sectional radius of their arc-shaped portion facing the central axis at the ion-exit end is smaller than that at the ion-entrance end. A voltage generator applies a DC voltage to the four electrodes and another DC voltage, which differs from the first one, to the N?4 remaining electrodes, in addition to RF voltages of opposite phases alternately applied to the N electrodes.

Abstract: A mass spectrometry device includes a vacuum container in which an ionizer, a mass separator and a detector are arranged, and includes an opening-closing portion that is provided at the vacuum container and switches between a locked state of being locked in a close state and an unlocked state by a difference in pressure between inside and outside of the vacuum container, and a cooling gas introducer that introduces a cooling gas for cooling the ionizer into the vacuum container such that the opening-closing portion is kept in the locked state.

Abstract: An ion guide (20) provided in a first intermediate vacuum chamber includes six rod electrodes (211 to 216) and a voltage generation unit. The six rod electrodes (211 to 216) are in a hexapole arrangement on the ion incident side, and the two rod electrodes (211 and 214) are tilted with respect to the Z-axis in a manner approaching a central axis (201) as they progress in the ion transport direction, so that the four rod electrodes (211, 214, 215, and 216) are in a quadrupole arrangement. The voltage generation unit applies radio-frequency voltages ±V cos ?t whose phases are inverted to each other between adjacent rod electrodes of the six rod electrodes (211 to 216) around the central axis (201), applies a DC voltage U1 to the four electrodes (211, 214, 215, and 216) by which ions pass through them in an excellent manner, and applies a DC voltage U2 different from U1 to the other two rod electrodes (212 and 213).

Abstract: A mass spectrometer includes an ion source including: an ionization chamber including an ion ejection hole, and an electron introduction port and an electron discharge port; a repeller electrode; a filament; a trap electrode; and a magnetic field forming unit. A first distance in a direction along the ion optical axis between an end of the electron introduction port on an ion ejection hole side and an inner face of a wall of the ionization chamber in which the ion ejection hole is formed and/or a second distance in a direction along the ion optical axis between an end of the electron introduction port on a repeller electrode side and the repeller electrode, is set to be larger than a radius of gyration of the thermal electron estimated based on energy imparted to the thermal electron and intensity of the magnetic field formed by the magnetic field forming unit.

Abstract: The present mass spectrometer has one or more intermediate vacuum chambers between an ion source to generate ions derived from a sample component in an atmospheric pressure atmosphere and a vacuum chamber where a mass separator is arranged, including an ion transport unit to have an ion outlet in a first intermediate vacuum chamber at a subsequent stage of the ion source and send ions to the first chamber, an exhaust opening portion to evacuate the first chamber, which is provided in front of ion flow discharged from the ion outlet into the first chamber, an ion delivery opening portion to send ions to a next stage, which is provided on a line intersecting a straight line connecting the ion outlet and the exhaust opening portion, and an ion guide to guide ions to the ion delivery opening portion by an action of a radio-frequency electric field.

Abstract: An ion analyzer includes an ion optical element having four rod electrodes around an optical axis, for transferring ions from their surrounding space to the subsequent stage while converging the ions. To create an RF electric field within this space, a voltage supplier applies RF voltages of opposite polarities to two pairs of electrodes facing each other across the axis. The cross-sectional shape of each electrode in a plane orthogonal to the axis has a first side having width w facing the axis and is tangent to a circle of radius r0 around the axis, and two adjacent sides connected to the ends of the first side at an angle determined so that an RF field created by the adjacent sides exerts no influence within the space. The ratio w/r0 is determined so that the amount of dodecapole field component becomes a predetermined value or does not exceed it.

Abstract: In order to improve the ionization efficiency and ion collection efficiency in an ESI ion source to achieve a higher level of analysis sensitivity while improving the throughput of the analysis, one mode of the present invention provides an ion analyzer equipped with an ion source employing an electrospray ionization method, where the ion source (2) includes: a plurality of capillaries (211-218) configured to spray a supplied liquid sample in the same direction; one or more auxiliary electrodes (23, 231-328) arranged so as to be surrounded by the plurality of capillaries; and a voltage supplier (24) configured to apply, to the plurality of capillaries, a DC high voltage for which the potential of the one or more auxiliary electrodes is used as a reference.

Abstract: An ionizer 1 including an ionization chamber 10, a sample gas introduction port 14 provided in the ionization chamber 10 for introducing sample gas, an electron beam emitting section 11 which emits an electron beam toward the ionization chamber 10, electron beam passage openings 10a and 10b which are formed on a path of the electron beam emitted from the electron beam emitting section 11 on a wall of the ionization chamber 10 and has a length in a direction of the path longer than a width of a cross section orthogonal to the direction, and an ion outlet 10c provided in the ionization chamber 10 for emitting an ion of the sample gas generated by irradiation with the electron beam, and a mass spectrometer 60 including the ionizer 1.

Abstract: An ion guide (20) provided in a first intermediate vacuum chamber includes six rod electrodes (211 to 216) and a voltage generation unit. The six rod electrodes (211 to 216) are in a hexapole arrangement on the ion incident side, and the two rod electrodes (211 and 214) are tilted with respect to the Z-axis in a manner approaching a central axis (201) as they progress in the ion transport direction, so that the four rod electrodes (211, 214, 215, and 216) are in a quadrupole arrangement. The voltage generation unit applies radio-frequency voltages ±Vcos?t whose phases are inverted to each other between adjacent rod electrodes of the six rod electrodes (211 to 216) around the central axis (201), applies a DC voltage U1 to the four electrodes (211, 214, 215, and 216) by which ions pass through them in an excellent manner, and applies a DC voltage U2 different from U1 to the other two rod electrodes (212 and 213).

Abstract: A quadrupole mass spectrometer includes: a quadrupole mass filter including a pre-rod; an ionization chamber; and an ion optical system that guides ions generated in the ionization chamber to the pre-rod of the quadrupole mass filter, wherein: a potential of an exit side electrode of the ion optical system is lower than a potential of the ionization chamber and a potential of the pre-rod of the quadrupole mass filter; and there is no structure that has a higher potential than the exit side electrode and decelerates the ions between the exit side electrode and the pre-rod.

Abstract: A quadrupole mass spectrometer includes: a quadrupole mass filter with four rod electrodes arranged so as to surround a central axis; and a magnet that forms a magnetic field in at least a part of an inside of the quadrupole mass filter in a direction intersecting the central axis.

Abstract: An ion detector (4) includes a shield electrode (42) between an aperture plate (41) and a conversion dynode (43). The shield electrode (42) has a rectilinearly-moving particle block wall (42a) positioned on an extension line (C?) extending from the central axis (C) of a quadrupole mass filter (3), and an ion attracting electric field adjustment wall (42b) inclined by a predetermined angle ? (acute angle) with respect to the extension line (C?). In the ion attracting electric field adjustment wall (42b) is provided an ion passing aperture (42c). The rectilinearly-moving particles, such as neutral particles, which are ejected from the quadrupole mass filter (3), are blocked by the rectilinearly-moving particle block wall (42a), thereby reducing noises caused by the rectilinearly-moving particles.

Abstract: A mass spectrometry device includes a vacuum container in which an ionizer, a mass separator and a detector are arranged, and includes an opening-closing portion that is provided at the vacuum container and switches between a locked state of being locked in a close state and an unlocked state by a difference in pressure between inside and outside of the vacuum container, and a cooling gas introducer that introduces a cooling gas for cooling the ionizer into the vacuum container such that the opening-closing portion is kept in the locked state.

Abstract: An ionizer 1 including an ionization chamber 10, a sample gas introduction port 14 provided in the ionization chamber 10 for introducing sample gas, an electron beam emitting section 11 which emits an electron beam toward the ionization chamber 10, electron beam passage openings 10a and 10b which are formed on a path of the electron beam emitted from the electron beam emitting section 11 on a wall of the ionization chamber 10 and has a length in a direction of the path longer than a width of a cross section orthogonal to the direction, and an ion outlet 10c provided in the ionization chamber 10 for emitting an ion of the sample gas generated by irradiation with the electron beam, and a mass spectrometer 60 including the ionizer 1.

Abstract: A quadrupole mass spectrometer includes: a quadrupole mass filter with four rod electrodes arranged so as to surround a central axis; and a magnet that forms a magnetic field in at least a part of an inside of the quadrupole mass filter in a direction intersecting the central axis.

Abstract: A quadrupole mass spectrometer includes: a quadrupole mass filter including a pre-rod; an ionization chamber; and an ion optical system that guides ions generated in the ionization chamber to the pre-rod of the quadrupole mass filter, wherein: a potential of an exit side electrode of the ion optical system is lower than a potential of the ionization chamber and a potential of the pre-rod of the quadrupole mass filter; and there is no structure that has a higher potential than the exit side electrode and decelerates the ions between the exit side electrode and the pre-rod.

Abstract: An ion detector (4) includes a shield electrode (42) between an aperture plate (41) and a conversion dynode (43). The shield electrode (42) has a rectilinearly-moving particle block wall (42a) positioned on an extension line (C?) extending from the central axis (C) of a quadrupole mass filter (3), and an ion attracting electric field adjustment wall (42b) inclined by a predetermined angle ? (acute angle) with respect to the extension line (C?). In the ion attracting electric field adjustment wall (42b) is provided an ion passing aperture (42c). The rectilinearly-moving particles, such as neutral particles, which are ejected from the quadrupole mass filter (3), are blocked by the rectilinearly-moving particle block wall (42a), thereby reducing noises caused by the rectilinearly-moving particles.

Abstract: A focusing electrode (8) of a flat plate shape is arranged so that an inlet end (9a) of a heated capillary (9) for introducing ions into a vacuum chamber as a subsequent stage is inserted into an opening portion (8a) of the focusing electrode (8). A reflecting electrode (7) of a flat plate shape is arranged at a position opposing the focusing electrode (8) across a spray flow ejected from an ionization probe (5). An auxiliary electrode (6) is grounded and arranged between the ionization probe (5) and each of the reflecting electrode (7) and the focusing electrode (8). The heated capillary (9) is grounded, and during a measurement of positive ions, a voltage V1 and a voltage V2, both satisfying a relationship of V1>V2>0, are respectively applied to the reflecting electrode (7) and the focusing electrode (8).

Abstract: A focusing electrode (8) of a flat plate shape is arranged so that an inlet end (9a) of a heated capillary (9) for introducing ions into a vacuum chamber as a subsequent stage is inserted into an opening portion (8a) of the focusing electrode (8). A reflecting electrode (7) of a flat plate shape is arranged at a position opposing the focusing electrode (8) across a spray flow ejected from an ionization probe (5). An auxiliary electrode (6) is grounded and arranged between the ionization probe (5) and each of the reflecting electrode (7) and the focusing electrode (8). The heated capillary (9) is grounded, and during a measurement of positive ions, a voltage V1 and a voltage V2, both satisfying a relationship of V1>V2>0, are respectively applied to the reflecting electrode (7) and the focusing electrode (8).