Figure 1.
Mass-selected FAIMS spectra for the 1:1 Leu/IIe mixture (solid lines) in He/N2 with ≤50% He (left) and ≥50% He (right). The values of resolution r are given for separated isomers. Pure Leu or IIe yield single peaks matching “L” and “I”, respectively (dashed lines in the right panel for IIe at 50–70% He).