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Related Experiment Video

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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

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Published on: July 27, 2018

Bipolar ion detector based on sequential conversion reactions.

Ming-Hsin Li¹, Shang-Ting Tsai, Chung-Hsuan Chen

¹Genomics Research Center, Academia Sinica, 128 Academia Road, Section 2, Nankang District, Taipei 115, Taiwan, Republic of China.

Analytical Chemistry

|February 15, 2007

Summary

This study presents a novel bipolar ion detector (BID) for mass spectrometers, offering higher detection efficiency than microchannel plate (MCP) detectors. This new ion detection technology enhances sensitivity for both positive and negative ions.

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Area of Science:

Analytical Chemistry
Mass Spectrometry Instrumentation
Detector Technology

Background:

Microchannel plate (MCP) detectors are standard for ion detection in mass spectrometry but have limitations in efficiency.
There is a need for advanced detectors capable of efficiently monitoring both positive and negative ions under identical conditions.

Purpose of the Study:

To demonstrate the feasibility of a novel scintillation detector for enhanced ion detection efficiency.
To compare the sensitivity of the proposed detector with traditional MCP detectors for a wide range of ion masses.

Main Methods:

Developed a bipolar ion detector (BID) consisting of an ion beam guiding device, a conversion dynode, and a scintillation detector.
Utilized sequential conversion reactions induced by ion-surface impacts for ion detection.
Measured detection efficiency and sensitivity for ions with mass-to-charge ratios up to 90,000.

Main Results:

The novel detector achieves greater detection efficiency compared to chevron-type MCP detectors.
The sensitivity of the BID was found to be 1.4-14.4 times higher than MCP detectors for ions up to m/z 90,000.
Detection efficiency increases with higher conversion dynode and ion acceleration voltages.

Conclusions:

The developed bipolar ion detector is a viable and more sensitive alternative for ion detection in mass spectrometry.
This technology offers improved performance for monitoring both positive and negative ions, expanding mass spectrometry capabilities.