Lastly, in the SI, we show an example of velocity relaxation where an ion mobility separation can become m/z dependent rather than mobility dependent. Fun project!

n this work, we developed reduced mass-only ion mobility separations to enable us to quantify the mass distribution component in our isotopic shifts. We also saw an ~7 Da inverse shift, where the heavier isotopologue arrived before the lighter one.

Our second and final one is from Noah Roberts (WP 359)

“Isolating Reduced Mass Contributions in Isotopic Shifts with High-Resolution Cyclic Ion Mobility Separations”