David G. Welkie

Mass spectrometry with segmented rf multiple ion guides in various pressure regions

Fragmentation methods for mass spectrometry

Charged particle trapping in near-surface potential wells

RF Surfaces and RF Ion Guides

Multiple detection systems

Ion detector, detector array and instrument using same

Vacuum-compatible air-cooled plasma device

Multipole ion guide interface for reduced background noise in mass spectrometry

Ion source and accelerator for improved dynamic range and mass selection in a time of flight mass spectrometer

ELECTROSTATIC LENSES AND SYSTEMS INCLUDING THE SAME