Overtone mobility spectrometry: part 3. On the origin of peaks.

Journal of the American Society for Mass Spectrometry

PubMedID: 21472515

Valentine SJ, Kurulugama RT, Clemmer DE. Overtone mobility spectrometry: part 3. On the origin of peaks. J Am Soc Mass Spectrom. 2011;22(5):804-16.
The origin of non-integer overtone peaks in overtone mobility spectrometry (OMS) spectra is investigated by ion trajectory simulations. Simulations indicate that these OMS features arise from higher-order overtone series. An empirically-derived formula is presented as a means of describing the positions of peaks. The new equation makes it possible to determine collision cross sections from any OMS peak. Additionally, it is extended as a means of predicting the resolving power for any peak in an OMS distribution.