VAMAS TWA 2, 2019, sub-project A27:" intensity calibration for XPS instruments using low-density poly(ethylene)": protocol for analysis

This report outlines the protocol for analysis in an interlaboratory study conducted under the auspices of VAMAS TWA 2 (Surface Chemical Analysis) for the intensity calibration for XPS instruments using polyethylene. The protocol involves using low-density poly(ethylene), scraped with a clean scalpel to remove surface oxygen, as a secondary calibration standard. For monochromated Al K(alpha) sources, the acquired spectrum is used in conjunction with a mathematically-generated poly(ethylene) reference spectrum to determine a representative transmission function. A rational function is then fitted to produce a noise-free continuous transmission function description which can be used to intensity-correct spectra from other materials. Participants will also acquire a spectrum from sputter cleaned gold for validation purposes. This report will guide VAMAS participants through the sample preparation, calibration process, and reporting of their results. For unmonochromated sources, the study will enable an assessment of whether poly(ethylene) could also be used as a secondary calibration standard.