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由英国标准学会 GB-BSI 发布于 2022-10-31,并于 2022-10-31 实施。
BS ISO 17862:2022在国际标准分类中归属于: 71.040.40 化学分析。
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