Development of a novel soft ionization aerosol mass spectrometer (SIAMS)

AEI 7

Julie A Lloyd, jlloyd@udel.edu, Department of Chemistry & Biochemistry, University of Delaware, 107 Brown Lab, Newark, DE 19716 and Murray V. Johnston, mvj@udel.edu, Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716.
A soft ionization aerosol mass spectrometer (SIAMS) has been developed for the on-line characterization of high molecular mass species found in aerosols (e.g. bioaerosols, oligomers). An integral step in the development was to modify an existing single-particle time of flight mass spectrometer by replacing the source region with a unique ion trap. The ion trap was machined specifically to accommodate a collection probe (~3 mm dia.) within the ring electrode. Analyte particles are generated externally and are focused through an aerodynamic lens system for deposition onto the collection probe. After deposition, a 351 nm laser beam enters the ion trap collinearly with the particle beam and irradiates the probe. Desorbed neutral species are softly ionized by either chemical ionization or MALDI and are immediately extracted into the time of flight mass spectrometer for detection. Tandem mass spectrometry experiments are also possible for greater characterization of the high molecular mass species.
 

Academic Employment Initiative
8:00 PM-10:00 PM, Monday, August 20, 2007 BCEC -- Exhibit Hall - B2, Sci-Mix

Academic Employment Initiative

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007