BS ISO 17862:2022 PDF

Scope: 1 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.

BS ISO 17862:2022 history

2022 BS ISO 17862:2022 Surface chemical analysis. Secondary ion mass spectrometry. Linearity of intensity scale in single ion counting time-of-flight mass analysers
2013 BS ISO 17862:2013 Surface chemical analysis. Secondary ion mass spectrometry. Linearity of intensity scale in single ion counting time-of-flight mass analysers