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公开(公告)号：US20240379339A1
公开(公告)日：2024-11-14
申请号：US18686152
申请日：2021-08-24
Applicant: SHIMADZU CORPORATION
Inventor： Keisuke ISO , Yuki TANAKA , Fumihiko HIRATA , Shingo FUJIOKA
Abstract: An ionizer disposed in an ionization chamber separated from an analysis chamber by a partition provided with an ion introduction port, the ionizer including: an electrospray ionization probe 111 configured to charge and nebulize a liquid sample as charged droplets, the electrospray ionization probe being disposed such that a nebulization axis is orthogonal to a central axis of the ion introduction port; and a heated gas supply mechanism configured to blow a heated gas to a position between a tip of the electrospray ionization probe and an intersection point X of the nebulization axis and the central axis, where the position is separated from the tip by a predetermined distance or more.
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公开(公告)号：US20210391164A1
公开(公告)日：2021-12-16
申请号：US17291824
申请日：2018-11-29
Applicant: SHIMADZU CORPORATION
Inventor： Manabu UEDA , Tomohito NAKANO , Yuki TANAKA
Abstract: A single type quadrupole mass spectrometer equipped with an ion source by the ESI method, which is a small device including a vacuum pump having a relatively small evacuation speed. The internal diameter of a desolvation tube for introducing ions from an ionization chamber into a first intermediate vacuum chamber is set to 0.4 mm φ, which is large for a small mass spectrometer. The evacuation speed of a rotary pump is determined so that the product of the cross-sectional opening area of the desolvation tube and the pressure in the first intermediate vacuum chamber falls within a range of 15 to 40 mm2·Pa. This can ensure high detection sensitivity and reduce clogging of the desolvation tube due to droplets. Since the pressure in the first intermediate vacuum chamber does not need to be increased more than necessary, a small rotary pump having a small evacuation speed can be used.
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