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Noise Characteristics of Phoenix TIMS Xact Faraday Detectors with 1 x 10e11 ohm resistors
Introduction High precision isotope ratios require an optimal signal to noise ratio. Here we assess the electronic noise of the new Xact Faraday detectors on Phoenix TIMS using a range of different integration times and compare the results to the theoretical noise calculated from the Johnson law. Experimental Phoenix has nine Faraday collectors each directly…
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Multidynamic measurement of small Neodymium (Nd+) ion signals on Faradays using Xact amplifiers with 1e11 Ω and 1e12 Ω (1T) resistors
Zenon Palacz, Davydd Wanless, Ian Turner & Tony Jones. Isotopx Ltd. UK Introduction Thermal Ionization Mass Spectrometry is an extremely sensitive detection technique. For Neodymium, measured as Nd+ , ion yields of 1 ion per 50 atoms loaded are typical for triple filament geometries on a Phoenix TIMS. This efficiency is of huge importance for…