期刊
TALANTA
卷 269, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.talanta.2023.125396
关键词
Ion mobility spectrometry; Bradbury-nielsen gate; Ion swarm shape; Discrimination effect reduction
This article proposes a novel method to address the limitations of the conventional ion gate in IMS systems, which effectively reduces trailing edge deformation, improves resolving power and signal intensity, and achieves reverse discrimination effect.
The ion gate is a critical element in drift tube ion mobility spectrometry (IMS) as it directly influences the resolving power and sensitivity of the system. However, the conventional Bradbury-Nielsen gate (BNG) often leads to deformation of the ion swarm shape, resulting in reduced resolving power and significant discrimination effects. To address these limitations, we propose a novel method that incorporates a cutting phase following the gate opening. This approach effectively reduces trailing edge deformation, resulting in a maximum resolving power of over 100 and increased signal intensity. Additionally, this method maintains high resolving power even during longer gate opening times. Remarkably, this method not only significantly reduces the mobility discrimination effect but also enables the achievement of reverse discrimination by adjusting the duration of the cutting phase. Consequently, it demonstrates the potential to selectively amplify the peak height of target ions. Our method offers straightforward implementation across all IMS systems utilizing the BNG, thereby significantly improving system performance.
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