Journal
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
Volume 23, Issue 4, Pages 736-744Publisher
SPRINGER
DOI: 10.1007/s13361-011-0303-9
Keywords
Dipolar DC collisional activation; Quadrupole ion trap; Stretched ion trap; Ion trap collision-induced dissociation
Funding
- Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy [DE-FG02-00ER15105]
- Jonathan Amy Facility for Chemical Instrumentation
- U.S. Department of Energy (DOE) [DE-FG02-00ER15105] Funding Source: U.S. Department of Energy (DOE)
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Applying dipolar DC (DDC) to the end-cap electrodes of a 3-D ion trap operated with a bath gas at roughly 1 mTorr gives rise to 'rf-heating' and can result in collision-induced dissociation (CID). This approach to ion trap CID differs from the conventional single-frequency resonance excitation approach in that it does not rely on tuning a supplementary frequency to coincide with the fundamental secular frequeny of the precursor ion of interest. Simulations using the program ITSIM 5.0 indicate that application of DDC physically displaces ions solely in the axial (inter end-cap) dimension whereupon ion acceleration occurs via power absorption from the drive rf. Experimental data shows that the degree of rf-heating in a stretched 3-D ion trap is not dependent solely on the ratio of the dipolar DC voltage/radio frequency (rf) amplitude, as a model based on a pure quadrupole field suggests. Rather, ion temperatures are shown to increase as the absolute values of the dipolar DC and rf amplitude both decrease. Simulations indicate that the presence of higher order multi-pole fields underlies this unexpected behavior. These findings have important implications for the use of DDC as a broad-band activation approach in multi-pole traps.
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