Probing Trapped Ion Energies Via Ion-Molecule Reaction Kinetics: Fourier Transform Ion Cyclotron Resonance Mass Spectrometry
Abstract
The kinetic energy-dependent Ar+N2 ion-molecule reaction has been used as a chemical thermometer to determine the kinetic energy of ions produced by electron ionization and trapped using a Fourier transform ion cyclotron resonance (FTICR) mass spectrometer. The rate constant for this reaction obtained on the FTICR mass spectrometer was compared to previous work, which allowed a kinetic energy estimate to be made. In addition, the effects of varying parameters such as trapping voltage and pressure on ion kinetic energy were investigated. No evidence of the differing reactivity of higher energy electronic states of Ar+, such as 2p1/2, was observed and the results of a model of this system are presented that support this observation. Pressure studies revealed that with an average of as few as 13 ion-molecule collisions, Ar+, ions are collisionally relaxed to an extent unaffected by additional collisions. Based on recent variable temperature selected ion flow drift tube (VT-SIFDT) measurements, FTICR ion energies are estimated to be slightly above thermal.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 28, 1992
- Accession Number
- ADA250974
Entities
People
- James E. Bruce
- John R. Eyler
Organizations
- University of Florida