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ISO 17862:2022

Surface chemical analysis — Secondary ion mass spectrometry — Linearity of intensity scale in single ion counting time-of-flight mass analysers

Publication date:   Sep 23, 2022

General information

60.60 Standard published   Sep 23, 2022

ISO

ISO/TC 201/SC 6 Secondary ion mass spectrometry

International Standard

71.040.40   Chemical analysis

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Scope

This document specifies a method for determining the maximum count rate for an acceptable limit of divergence from linearity of the intensity scale in single ion counting time-of-flight (TOF) secondary ion mass spectrometers using a test based on isotopic ratios in spectra from poly(tetrafluoroethylene) (PTFE). It also includes a method to correct for intensity nonlinearity arising from intensity lost from a microchannel plate (MCP) or scintillator and photomultiplier followed by a time-to-digital converter (TDC) detection system caused by secondary ions arriving during its dead-time. The correction can increase the intensity range for 95 % linearity by a factor of up to more than 50 so that a higher maximum count rate can be employed for those spectrometers for which the relevant correction formulae have been shown to be valid.

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PREVIOUSLY

WITHDRAWN
ISO 17862:2013

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PUBLISHED
ISO 17862:2022
60.60 Standard published
Sep 23, 2022