High-pressure ion trap mass spectrometry.
The effects of buffer gas pressure on ion trap stability, mass resolution/calibration, and choice of mass scanning are described. Pressure effects were treated phenomenologically by adding a drag term to the ion equations of motion. The resulting collisional damping enlarges the mass-dependent stability region but reduces the region in which mass-selective resonance ejection can be performed. The pressure effects can be reduced by increasing the frequency of the alternating quadrupole field.
Oak Ridge National Laboratory, PO Box 2008 MS 6142, Oak Ridge, TN 37831-6142, USA. whittenwb@ornl.gov
William B
WB
Whitten
Peter T A
PT
Reilly
J Michael
JM
Ramsey