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Title: Chemical characterization of microparticles by laser ablation in an ion trap mass spectrometer

Abstract

We are developing a new technique for the chemical characterization of microparticles based upon the use of electrodynamic traps. The electrodynamic trap has achieved widespread use in the mass spectrometry community in the form of the ion trap mass spectrometer or quadrupole ion trap. Small macroscopic particles can be confined or leviated within the electrode structure of a three-dimensional quadrupole electrodynamic trap in the same way as fundamental charges or molecular ions by using a combination of ac and dc potentials. Our concept is to use the same electrode structure to perform both microparticle levitation and ion trapping/mass analysis. The microparticle will first be trapped and spatially stabilized within the trap for characterization by optical probes, i.e., absorption, fluorescence, or Raman spectroscopy. After the particle has been optically characterized, it is further characterized using mass spectrometry. Ions are generated from the particle surface using laser ablation or desorption. The characteristics of the applied voltages are changed to trap the ions formed by the laser with the ions subsequently mass analyzed. The work described in this paper focuses on the ability to perform laser desorption experiments on microparticles contained within the ion trap. Laser desorption has previously been demonstrated in ionmore » trap devices by applying the sample to a probe which is inserted so as to place the sample at the surface of the ring electrode. Our technique requires the placement of a microparticle in the center of the trap. Our initial experiments have been performed on falling microparticles rather than levitated particles to eliminate voltage switching requirements when changing from particle to ion trapping modes.« less

Authors:
; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (USA)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (USA)
OSTI Identifier:
5619528
Report Number(s):
CONF-9105181-6
ON: DE91012513
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Conference
Resource Relation:
Conference: American Society for Mass Spectrometry (ASMS) meeting, Nashville, TN (USA), 19-24 May 1991
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; PARTICLES; CHEMICAL PROPERTIES; TRAPS; MASS SPECTROSCOPY; ABLATION; LASER RADIATION; LEVITATION; MASS SPECTROMETERS; NEODYMIUM LASERS; ELECTROMAGNETIC RADIATION; LASERS; MEASURING INSTRUMENTS; RADIATIONS; SOLID STATE LASERS; SPECTROMETERS; SPECTROSCOPY; 656002* - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-); 400201 - Chemical & Physicochemical Properties

Citation Formats

Dale, J M, Whitten, W B, and Ramsey, J M. Chemical characterization of microparticles by laser ablation in an ion trap mass spectrometer. United States: N. p., 1991. Web.
Dale, J M, Whitten, W B, & Ramsey, J M. Chemical characterization of microparticles by laser ablation in an ion trap mass spectrometer. United States.
Dale, J M, Whitten, W B, and Ramsey, J M. Tue . "Chemical characterization of microparticles by laser ablation in an ion trap mass spectrometer". United States. https://www.osti.gov/servlets/purl/5619528.
@article{osti_5619528,
title = {Chemical characterization of microparticles by laser ablation in an ion trap mass spectrometer},
author = {Dale, J M and Whitten, W B and Ramsey, J M},
abstractNote = {We are developing a new technique for the chemical characterization of microparticles based upon the use of electrodynamic traps. The electrodynamic trap has achieved widespread use in the mass spectrometry community in the form of the ion trap mass spectrometer or quadrupole ion trap. Small macroscopic particles can be confined or leviated within the electrode structure of a three-dimensional quadrupole electrodynamic trap in the same way as fundamental charges or molecular ions by using a combination of ac and dc potentials. Our concept is to use the same electrode structure to perform both microparticle levitation and ion trapping/mass analysis. The microparticle will first be trapped and spatially stabilized within the trap for characterization by optical probes, i.e., absorption, fluorescence, or Raman spectroscopy. After the particle has been optically characterized, it is further characterized using mass spectrometry. Ions are generated from the particle surface using laser ablation or desorption. The characteristics of the applied voltages are changed to trap the ions formed by the laser with the ions subsequently mass analyzed. The work described in this paper focuses on the ability to perform laser desorption experiments on microparticles contained within the ion trap. Laser desorption has previously been demonstrated in ion trap devices by applying the sample to a probe which is inserted so as to place the sample at the surface of the ring electrode. Our technique requires the placement of a microparticle in the center of the trap. Our initial experiments have been performed on falling microparticles rather than levitated particles to eliminate voltage switching requirements when changing from particle to ion trapping modes.},
doi = {},
url = {https://www.osti.gov/biblio/5619528}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}

Conference:
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