LAMPAS 2

The method of bipolar on-line laser mass spectrometry was developed in our institute for fast and complete characterization of single particles from ambient aerosols. The technique was realized in the transportable laser mass spectrometer LAMPAS 2 (Laser Mass Analyzer for Particles in the Airborne State, see Figure). The instrument provides for a minimization of artifacts during particle analysis by a direct inlet of the particle-containing air into the mass spectrometer.

Particles are detected by two continuous-wave laser beams for registration and size determination. After detection the particles are vaporized and ionized by a pulsed UV laser beam. The generated positive and negative ions provide for an identification of the atomic and molecular particle constituents. The ions are accelerated in an electrical field and are detected simultaneously by two time-of-flight mass spectrometers. Computerized classification procedures and pattern recognition techniques are used for data interpretation and characterization of particle populations.

The transportable particle mass spectrometer LAMPAS 2 has been successfully tested and applied during several field campaigns at various locations for size-resolved determination of the chemical composition of single particles and particle populations. The instrument is used for investigations of the relevance of particles for earth climate changes and, in combination with an additional instrument of this type, for basic investigations of laser-induced ion generation as well as in aerosol chemistry.

Applications

• investigations of atmosphere (climate forcing, ozone depletion)
• medical applications (allergy research, toxicology, bioaerosols)
• clean room controlling
• motor vehicle exhaust analysis
• indoor particle charaterization

Keywords

• Mass Spectrometry of single airborne particles and aerosols.

Contact person

• Prof. Dr. Bernhard Spengler