Accession Number : ADA295592

Title :   The Design and Construction of an Ion Trap Based System for Laser Pyrolysis/Mass Spectrometry of Single Organic Aerosol Particles.

Descriptive Note : Final rept. Aug 91-Dec 94,

Corporate Author : UTAH UNIV SALT LAKE CITY CENTER FOR MICRO ANALYSIS AND REACTION CHEMISTRY

Personal Author(s) : Meuzelaar, Henk L. ; Arnold, Neil S. ; Hars, George ; Cole, Paul A.

PDF Url : ADA295592

Report Date : MAR 1995

Pagination or Media Count : 49

Abstract : A multifunction Paul trap capable of stabilizing and analyzing electrostatically charged microparticles as well as a broad range of ions and macro-ions has been developed. Typically, particles in the 0.1-10/m range are introduced by aerosolization and a single particle is selected and stabilized under scattered light observation while the pressure is reduced to < 1(exp-5) torr. A new particle trajectory pattern, observed in the equatorial plane, offers a potentially new, nondestructive, optical method for determining the m/z value of microparticles and macro-ions, with a maximum theoretical accuracy of approx. 1:10(exp 6). Irradiation of the particle with a Nd YAG laser enables production of laser fragmentation/ionization mass spectra of 1 micrometer dia polystyrene particles and of Bacillus subtilis spores. Shot-to-shot reproducibility is still unsatisfactory, however, and mass calibration problems need to be resolved. Nonetheless, the high intensity and complex organic nature of the ion signals indicate the potentiality for chemical and physical characterization of single microorganisms and other components of respirable aerosols. jg

Descriptors :   *IONS, *AEROSOLS, *TRAPPING(CHARGED PARTICLES), *LASERS, *ORGANIC MATERIALS, *PYROLYSIS, *MASS SPECTROMETRY, YAG LASERS, LIGHT SCATTERING, OPTICAL PROPERTIES, PRODUCTION, OBSERVATION, POLYSTYRENE, SPORES, BACILLUS SUBTILIS, SIGNALS, PATTERNS, CALIBRATION, HIGH INTENSITY, IRRADIATION, RESPIRATION, NEODYMIUM, MICROORGANISMS, PARTICLE TRAJECTORIES.

Subject Categories : Inorganic Chemistry
      Organic Chemistry
      Physical Chemistry
      Lasers and Masers
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE