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

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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.

Author(s):
Bruce, James E. ; Eyler, John R.
Author Organization(s):
FLORIDA UNIV GAINESVILLE DEPT OF CHEMISTRY
Descriptive Note:
Technical rept. Jan 1990-Apr 1992,
Pagination:
0022

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-36
Contract/Grant Number(s):
N00014-87-J-1248
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_1_Force Support; JCA_4.5.4_Requirements Definition; JCA_4.5_Operational Contract Support; JCA_1.3_Human Capital Management; JCA_1.3.2_Personnel Management; JCA_1.2.7_Experimentation; JCA_1.2_Force Preparation; JCA_1.2.3_Educating
Modernization Areas:
Quantum Science and Computing
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*IONS, *MASS SPECTROMETRY, *CYCLOTRON RESONANCE, *MOLECULES, *REACTIVITIES, *KINETICS, MASS, OBSERVATION, ENERGY, RATES, VOLTAGE, SPECTROMETRY, ESTIMATES, TIME, VARIABLES, CYCLOTRONS, DRIFT, FLIGHT, ELECTRONIC STATES, CONSTANTS, RESONANCE, KINETIC ENERGY, PRESSURE, IONIZATION, WORK, MASS SPECTROMETERS, FLOW, SPECTROMETERS, COLLISIONS, ADDITION, PARAMETERS, CHEMICALS, MODELS, TEMPERATURE, MEASUREMENT, ELECTRONICS, ELECTRONS
Field(s)/Group(s):
Inorganic Chemistry, Electricity and Magnetism, Atomic and Molecular Physics and Spectroscopy, Mechanics
Keyword(s):
TRAPPING(CHARGED PARTICLES)
Report Date:
1992 May 28