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Title: Laser-based studies with an ion-trap mass spectrometer: Ion tomography and analytical applications

Abstract

The iron trap mass spectrometer (ITMS) is an ion storage device which consists of two hyperbolic endcaps and a hyperbolic ring electrode. This forms a trapping cavity having a volume of several cm{sup 3}. An rf potential applied to the ring electrode produces a time-varying potential which can be used to trap and/or manipulate ions under controlled conditions. This device has been used in ion trapping studies for a number of years. More recently, a commercial version has been produced and sold which allows for mass-selective ejection of trapped ions, with subsequent detection by an electron multiplier. In this mode, it operates as a compact, high efficiency, high resolution mass spectrometer. The instrument has found applications in GC/MS, in tandem mass spectroscopy and in portable mass spectral analysis. In this manuscript, we present a survey of recent results incorporating laser desorption, ionization, or photodissociation with ITMS. In one instance, we describe the use of laser photodissociation to map the spatial distribution of trapped ions in the ITMS. In this tomographic study, we have parameterized the effects of trapping potential, buffer gas pressure, supplementary rf-potential, and laser intensity. In separate studies, laser desorption was used to generate gas phase ions inmore » the ITMS from a solid probe, by irradiation of both neat and matrix-dissolved samples. The latter experiment produced both high molecular weight ions, and significant numbers of negative ions. 6 refs.« less

Authors:
; ; ;  [1];  [2];  [3]
  1. Los Alamos National Lab., NM (United States)
  2. Purdue Univ., Lafayette, IN (United States). Dept. of Chemistry
  3. Finnigan MAT, San Jose, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab., NM (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
7207015
Report Number(s):
LA-UR-92-1862; CONF-920574-10
ON: DE92017529
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 6. international symposium on resonance ionization spectroscopy and its applications, Santa Fe, NM (United States), 24-29 May 1992
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 47 OTHER INSTRUMENTATION; MASS SPECTROMETERS; PERFORMANCE; ORGANIC COMPOUNDS; MASS SPECTROSCOPY; DESORPTION; DISSOCIATION; IONIZATION; LASER RADIATION; RF SYSTEMS; TOMOGRAPHY; TRAPPING; TRAPS; DIAGNOSTIC TECHNIQUES; ELECTROMAGNETIC RADIATION; MEASURING INSTRUMENTS; RADIATIONS; SORPTION; SPECTROMETERS; SPECTROSCOPY; 400102* - Chemical & Spectral Procedures; 440800 - Miscellaneous Instrumentation- (1990-)

Citation Formats

Alexander, M L, Cisper, M E, Hemberger, P H, Nogar, N S, Williams, J D, and Syka, J E.P. Laser-based studies with an ion-trap mass spectrometer: Ion tomography and analytical applications. United States: N. p., 1992. Web.
Alexander, M L, Cisper, M E, Hemberger, P H, Nogar, N S, Williams, J D, & Syka, J E.P. Laser-based studies with an ion-trap mass spectrometer: Ion tomography and analytical applications. United States.
Alexander, M L, Cisper, M E, Hemberger, P H, Nogar, N S, Williams, J D, and Syka, J E.P. Wed . "Laser-based studies with an ion-trap mass spectrometer: Ion tomography and analytical applications". United States.
@article{osti_7207015,
title = {Laser-based studies with an ion-trap mass spectrometer: Ion tomography and analytical applications},
author = {Alexander, M L and Cisper, M E and Hemberger, P H and Nogar, N S and Williams, J D and Syka, J E.P.},
abstractNote = {The iron trap mass spectrometer (ITMS) is an ion storage device which consists of two hyperbolic endcaps and a hyperbolic ring electrode. This forms a trapping cavity having a volume of several cm{sup 3}. An rf potential applied to the ring electrode produces a time-varying potential which can be used to trap and/or manipulate ions under controlled conditions. This device has been used in ion trapping studies for a number of years. More recently, a commercial version has been produced and sold which allows for mass-selective ejection of trapped ions, with subsequent detection by an electron multiplier. In this mode, it operates as a compact, high efficiency, high resolution mass spectrometer. The instrument has found applications in GC/MS, in tandem mass spectroscopy and in portable mass spectral analysis. In this manuscript, we present a survey of recent results incorporating laser desorption, ionization, or photodissociation with ITMS. In one instance, we describe the use of laser photodissociation to map the spatial distribution of trapped ions in the ITMS. In this tomographic study, we have parameterized the effects of trapping potential, buffer gas pressure, supplementary rf-potential, and laser intensity. In separate studies, laser desorption was used to generate gas phase ions in the ITMS from a solid probe, by irradiation of both neat and matrix-dissolved samples. The latter experiment produced both high molecular weight ions, and significant numbers of negative ions. 6 refs.},
doi = {},
url = {https://www.osti.gov/biblio/7207015}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

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