How long should I measure baselines for a Faraday analysis?
Faraday analyses on TIMS and ICPMS consist of a baseline and an on-peak measurement, where the ion beam intensity of interest is the on-peak intensity minus the baseline. The baselines are often measured between the mass spectrum peaks while a finite-sized sample is ionizing. How long the baseline and on-peak portions of the analysis are measured is specified by the user. What is the best ratio of baseline to on-peak measurement time? The answer depends on the size of the ion beam and the size of the resistors in the Faraday amplifiers.