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.
Whitten
William B
WB
Oak Ridge National Laboratory, PO Box 2008 MS 6142, Oak Ridge, TN 37831-6142, USA. whittenwb@ornl.gov
Reilly
Peter T A
PT
Ramsey
J Michael
JM