Accession Number:

ADA250974

Title:

Probing Trapped Ion Energies Via Ion-Molecule Reaction Kinetics: Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Descriptive Note:

Technical rept. Jan 1990-Apr 1992,

Corporate Author:

FLORIDA UNIV GAINESVILLE DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

1992-05-28

Pagination or Media Count:

22.0

Abstract:

The kinetic energy-dependent ArN2 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 2p12, 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.

Subject Categories:

  • Inorganic Chemistry
  • Electricity and Magnetism
  • Atomic and Molecular Physics and Spectroscopy
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE