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Constant-Fraction Discrimination/Boxcar Integrator for Plasma Source Time-of-Flight Mass Spectrometry

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A constant-fraction discrimination (CFD) system has been combined with a boxcar integrator for detection in inductively coupled plasma/time-of-flight mass spectrometry. The discriminator provides gating logic for the boxcar integrator when an incoming ion signal occurs, but discriminates against electronic or background noise of lower amplitude. As a result, the combination can effectively reject noise and accumulate analyte signal, rather than relying on an averaging process to reduce noise levels. The signal-to-noise ratio is therefore enhanced in this operation compared with the conventional boxcar method. The dynamic range of the detection system is at least five orders of magnitude.

Keywords: CFD-boxcar integrator; ICP-MS; Signal-to-noise ratio enhancement; TOFMS

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702953964057

Affiliations: 1: Department of Chemistry, Indiana University, Bloomington, Indiana 47405; On leave from the Department of Chemistry, Xiamen University, Peoples' Republic of China, 361005 2: Department of Chemistry, Indiana University, Bloomington, Indiana 47405

Publication date: May 1, 1995

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