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Title: Radio-frequency mass selective excitation and resonant ejection of ions in a three-dimensional quadrupole ion trap

Abstract

The three-dimensional quadrupole ion store (QUISTOR) has been employed as a reactor for the study of ion/molecule reactions using external mass analysis, and as an ion trap for the study of stored ion dynamics using either external mass or in situ resonant absorption. Excitation of the axial frequency component of ion motion is accomplished by application of small (approx.1 V) RF potentials to an end-cap of the QUISTOR. The frequencies at which ion resonance is observed differ from those predicted by theory and are dependent upon trapped ion density. Thus, the frequency shift may be related to both the space charge within the QUISTOR and perturbation of the stability diagram. the simultaneous application of in situ resonance absorption and external mass analysis has been utilized in three separate studies. (1) In ionized argon, Ar/sup +/ has been ejected by resonance absorption and the rate constant for the subsequent partial charge reaction of Ar/sup 2 +/ with argon has been determined to be 4.8 +- 1.6 x 10/sup -1/2 cm/sup 3/ molecule/sup -1/s/sup -1/. (2) In ionized 2-propanol at approx.0.1 Pa and 4 ms after the ionizing pulse, we have found the ambient space charge experienced simultaneously by nine ion speciesmore » to be sensibly constant. (3) The coupling of precursor to product ions in ion/molecule reactions of the 2-propanol system has been investigated: this particular application closely resembles the double resonance technique in ion cyclotron resonance mass spectrometry.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Department of Chemistry, Trent University, Peterborough, Ontario, Canada K9J 7B8
OSTI Identifier:
5126038
Resource Type:
Journal Article
Journal Name:
J. Vac. Sci. Technol.; (United States)
Additional Journal Information:
Journal Volume: 17:4
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ION BEAMS; TRAPPING; ARGON IONS; EXCITATION; ION CYCLOTRON RESONANCE SPECTROSCOPY; ION DENSITY; IONS; MAGNETIC FIELDS; MASS SPECTROMETERS; MATHIEU EQUATION; MOLECULES; PROPANOLS; QUADRUPOLAR CONFIGURATIONS; RADIOWAVE RADIATION; REACTION KINETICS; RESONANCE; SPACE CHARGE; ALCOHOLS; BEAMS; CHARGED PARTICLES; CLOSED CONFIGURATIONS; DIFFERENTIAL EQUATIONS; ELECTROMAGNETIC RADIATION; ENERGY-LEVEL TRANSITIONS; EQUATIONS; HYDROXY COMPOUNDS; ION SPECTROSCOPY; KINETICS; MAGNETIC FIELD CONFIGURATIONS; MEASURING INSTRUMENTS; MULTIPOLAR CONFIGURATIONS; ORGANIC COMPOUNDS; RADIATIONS; SPECTROMETERS; SPECTROSCOPY; 640301* - Atomic, Molecular & Chemical Physics- Beams & their Reactions

Citation Formats

Fulford, J E, Nhu-Hoa, D, Hughes, R J, March, R E, Bonner, R F, and Wong, G J. Radio-frequency mass selective excitation and resonant ejection of ions in a three-dimensional quadrupole ion trap. United States: N. p., 1980. Web. doi:10.1116/1.570570.
Fulford, J E, Nhu-Hoa, D, Hughes, R J, March, R E, Bonner, R F, & Wong, G J. Radio-frequency mass selective excitation and resonant ejection of ions in a three-dimensional quadrupole ion trap. United States. https://doi.org/10.1116/1.570570
Fulford, J E, Nhu-Hoa, D, Hughes, R J, March, R E, Bonner, R F, and Wong, G J. Tue . "Radio-frequency mass selective excitation and resonant ejection of ions in a three-dimensional quadrupole ion trap". United States. https://doi.org/10.1116/1.570570.
@article{osti_5126038,
title = {Radio-frequency mass selective excitation and resonant ejection of ions in a three-dimensional quadrupole ion trap},
author = {Fulford, J E and Nhu-Hoa, D and Hughes, R J and March, R E and Bonner, R F and Wong, G J},
abstractNote = {The three-dimensional quadrupole ion store (QUISTOR) has been employed as a reactor for the study of ion/molecule reactions using external mass analysis, and as an ion trap for the study of stored ion dynamics using either external mass or in situ resonant absorption. Excitation of the axial frequency component of ion motion is accomplished by application of small (approx.1 V) RF potentials to an end-cap of the QUISTOR. The frequencies at which ion resonance is observed differ from those predicted by theory and are dependent upon trapped ion density. Thus, the frequency shift may be related to both the space charge within the QUISTOR and perturbation of the stability diagram. the simultaneous application of in situ resonance absorption and external mass analysis has been utilized in three separate studies. (1) In ionized argon, Ar/sup +/ has been ejected by resonance absorption and the rate constant for the subsequent partial charge reaction of Ar/sup 2 +/ with argon has been determined to be 4.8 +- 1.6 x 10/sup -1/2 cm/sup 3/ molecule/sup -1/s/sup -1/. (2) In ionized 2-propanol at approx.0.1 Pa and 4 ms after the ionizing pulse, we have found the ambient space charge experienced simultaneously by nine ion species to be sensibly constant. (3) The coupling of precursor to product ions in ion/molecule reactions of the 2-propanol system has been investigated: this particular application closely resembles the double resonance technique in ion cyclotron resonance mass spectrometry.},
doi = {10.1116/1.570570},
url = {https://www.osti.gov/biblio/5126038}, journal = {J. Vac. Sci. Technol.; (United States)},
number = ,
volume = 17:4,
place = {United States},
year = {1980},
month = {7}
}