Non-destructive characterization and alignment of aerodynamically focused particle beams using single particle charge detection

W. Henry Benner, Michael J. Bogan, Urs Rohner, Sébastien Boutet, Bruce Woods, Matthias Frank

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We describe the first experimental measurements of aerodynamically focused particle beams using single particle image-charge detection. An aerodynamic lens produces particle beams, which at times is not aligned with the bore of the lens, thus complicating the process of aligning a particle beam with the focus of a laser beam. A key result of this work is the development of a non-optical technique for aiming a beam of particles in vacuum into the focus of a laser beam. In the present application, the laser beam is fixed in space by the geometry of a large stationary vacuum system and it is necessary to blindly aim a narrowly focused particle beam across the laser beam. Our aiming device is based on the non-destructive detection of electrically charged particles as they pass through a small metal tube that picks up the image charge of the transiting particle. Individual electrosprayed particles larger than 70 nm produce an electrical pulse that can be thresholded and counted. The duration of the detector signal provides a way to measure particle velocity and the amplitude of the signal is proportional to particle charge. The rate of particle injection into vacuum, single particle velocity and charge and particle beam shape and position can be measured with the charge detector. We show data for aiming and focusing electrosprayed polystyrene latex spheres ranging in size from 70 to 190 nm. Particle injection rates as high as 3000 per second and particle beam diameters as small as 250 μ m were achieved by using the charge detector to optimize the performance of the aerodynamic lens to focus the particles before they entered. We also describe how this detector and injector system will be implemented for real-time particle analysis for aerosol mass spectrometry and single particle X-ray diffractive imaging.

Original languageEnglish (US)
Pages (from-to)917-928
Number of pages12
JournalJournal of Aerosol Science
Volume39
Issue number11
DOIs
StatePublished - Nov 1 2008
Externally publishedYes

Fingerprint

Particle beams
Laser beams
Detectors
Lenses
Vacuum
Particles (particulate matter)
Aerodynamics
Charged particles
Aerosols
Latexes
laser
Mass spectrometry
detection
alignment
particle
Polystyrenes
Metals
Imaging techniques
X rays
Geometry

Keywords

  • Aerodynamic focusing
  • Mass spectrometry
  • Particle charge
  • Particle charge detector
  • Single particle
  • X-ray diffractive imaging

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Materials Science(all)

Cite this

Non-destructive characterization and alignment of aerodynamically focused particle beams using single particle charge detection. / Benner, W. Henry; Bogan, Michael J.; Rohner, Urs; Boutet, Sébastien; Woods, Bruce; Frank, Matthias.

In: Journal of Aerosol Science, Vol. 39, No. 11, 01.11.2008, p. 917-928.

Research output: Contribution to journalArticle

Benner, W. Henry ; Bogan, Michael J. ; Rohner, Urs ; Boutet, Sébastien ; Woods, Bruce ; Frank, Matthias. / Non-destructive characterization and alignment of aerodynamically focused particle beams using single particle charge detection. In: Journal of Aerosol Science. 2008 ; Vol. 39, No. 11. pp. 917-928.
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