Ion detectors and mass spectrometers

JP7877545B1Active Publication Date: 2026-06-22HAMAMATSU PHOTONICS KK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
HAMAMATSU PHOTONICS KK
Filing Date
2025-04-17
Publication Date
2026-06-22

AI Technical Summary

Technical Problem

Ion detectors in time-of-flight mass spectrometers experience variations in ion detection time due to varying distances electrons travel from the conversion electrode to the microchannel plate, affecting mass spectrometry resolution.

Method used

An ion detector design with an incident electrode, conversion electrode, exit electrode, electron control electrode, and output unit, where the electron control electrode is positively potentialized relative to the conversion electrode, accelerating electrons to reduce velocity variations and enhance detection time consistency.

Benefits of technology

The ion detector suppresses variations in ion detection time for ions with the same mass-to-charge ratio, improving the resolution of mass spectrometry by ensuring consistent electron propagation and detection.

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Abstract

The present invention provides an ion detector that can suppress variations in ion detection time for ions with the same mass-to-charge ratio, and a mass spectrometer that can improve the resolution of mass spectrometry. [Solution] The ion detector 1A includes an incident electrode 20 which includes an incident section 21 through which ions i pass; a conversion electrode 30 which emits electrons e in response to the incidence of ions i that have passed through the incident section 21; an exit electrode 40 which is located on the incident electrode 20 side in the Z direction relative to the conversion electrode 30 and on one side in the X direction relative to the conversion electrode 30 and includes an exit section 41 which allows electrons e emitted from the conversion electrode 30 to pass through; and an electronic control electrode 90 which is located between the conversion electrode 30 and the exit section 41 in the Z direction and faces the conversion electrode 30 in the Z direction and includes a passing section 91 which allows ions i traveling from the incident electrode 20 to the conversion electrode 30 to pass through, and electrons e traveling from the conversion electrode 30 to the exit electrode 40 to pass through.
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