Chemical characterization of microparticles by laser ablation in an ion trap mass spectrometer
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 levitated 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.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5724980
- Report Number(s):
- CONF-9104192-10; ON: DE91014258
- Country of Publication:
- United States
- Language:
- English
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Laser desorption mass spectrometry of a single levitated microparticle in a quadrupole ion trap
Laser desorption mass spectrometry of a levitated single microparticle in a quadrupole ion trap
Related Subjects
400102 -- Chemical & Spectral Procedures
656002* -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABLATION
CHEMICAL PROPERTIES
LASERS
MASS SPECTROMETERS
MASS SPECTROSCOPY
MEASURING INSTRUMENTS
MICROANALYSIS
MULTIPOLES
NEODYMIUM LASERS
PARTICLES
QUADRUPOLES
SOLID STATE LASERS
SPECTROMETERS
SPECTROSCOPY
TRAPS