Abstract
A V-shaped ion funnel (IF) drift tube was developed for proton transfer reaction mass spectrometry (PTR-MS). The ion transmissions were characterized at variable radio frequency voltages and frequencies to obtain optimized conditions while considering the effects of radial-focusing, reaction rate, and collision-induced dissociation. The improvements in sensitivity for common compounds were experimentally obtained and ranges from 2 to 22 times depending on the analyte. The product ions distributions were also studied for V-shaped IF PTR-MS. Together with the literature reports for U-shaped IF PTR-MS, a valuable and comprehensive reference is provided for future optimization of IF PTR-MS and other mass spectrometers.
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