Skip to main content
. Author manuscript; available in PMC: 2015 Jul 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2014 Jan 23;25(7):1098–1113. doi: 10.1007/s13361-013-0808-5

Figure 6.

Figure 6

(A) Flyback and two-harmonic waveforms. The two-harmonic shape is used by AB SCIEX in the DMS API 3000, and the flyback shape on the ion trap. (B) Using ab-initio thermochemical values, the mean number of bound neutrals is shown as a function of DMS field and transport gas temperature at 1 atm. The maximum neutral count is limited to 3 because shell thermochemistry has not been calculated. These results for R-alphamethylhistamine, which has a polar core similar to dG, with 1.5% isopropanol show that bulk gas temperature is an essential controlling parameter in modifier DMS selectivity and that multiple clustering is common even at relatively high bulk gas temperatures.