Accurate mass

A mass measured to four or more decimal places, sufficient to compute a unique molecular formula. High-resolution accurate-mass (HRAM) instruments (Q-TOF, Orbitrap, FT-ICR) deliver mass accuracy below 5 ppm, which is the working threshold for formula assignment.

Explained in

Mass Spectrometry: Principles, Ionisation and Mass Analysers

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Accurate mass

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