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1. Mass Spectrometry

   Linked via "isotopic interference"

   where $t_{1/2}$ is the mean time-of-flight (or center frequency) and $\Delta t$ is the width of the peak at half its height. High-resolution instruments, such as Orbitrap or Fourier Transform Ion Cyclotron Resonance (FT-ICR) mass spectrometers, can achieve resolutions exceeding $100,000$, enabling the precise determination of elemental composition by resolving masses that differ by only a few milliDaltons.
   Mass accuracy is the closeness of the measured mass to the tr…