NARSTO EPA_SS_ATLANTA 1999 Rapid Single-Particle Mass Spectrometer DataEntry ID: NARSTO_EPA_SS_ATL_RSMS
Abstract: During a month in the summer of 1999, individual aerosol particles
were sized and analyzed using a Rapid Single-particle Mass
Spectrometer (RSMS) in Atlanta. RSMS aerodynamically focuses one
particle size at a time to the source region of a mass spectrometer
and employs a 193 nm excimer laser to desorb and ionize the particle
components. The ions are analyzed in a single time-of-flight mass
... spectrometer and the spectrum is digitally recorded. Spectra are only
saved if the ion peak in the spectrum is above a threshold level.
Background spectra were determined and flagged. Particle size scans
were initiated periodically and each size was sampled until 30
particle hits were obtained, unless the sampling time became
excessive. Aerodynamic particle sizes ranged from about 40 to 1300 nm
and were partitioned into nine discrete size classes logarithmically
spaced, roughly, over the range. Single particle data are valuable
because for instance a) they are collected and analyzed real time so
have excellent temporal resolution, b) the particle-to-particle
composition variations (external mixing properties) can be assessed,
and c) key particle sources are easily identified since the particles
retain source characteristics. The data resulting from these
measurements consist of an aerodynamic particle size and a positive
mass spectrum of the components for each particle, along with the date
and time of measurement and other incidental measurement parameters
such as the laser pulse energy. Support for RSMS measurements has
been provided by the EPA Supersite program and additional funding from
the EPA and NSF.
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Start Date: 1999-08-01Stop Date: 1999-08-31
Role: DIF AUTHOR
Email: support-asdc at earthdata.nasa.gov
NASA Langley Atmospheric Science Data Center User and Data Services NASA Langley Research Center Mail Stop 157D
Province or State: VA
Postal Code: 23681-2199
Role: TECHNICAL CONTACT
Email: aswexler at ucdavis.edu
Email: mvj at udel.edu
Phares, D.J., K.P. Rhoads, and A.S. Wexler. 2002. Performance of a
single ultrafine particle mass spectrometer. Aerosol Sci. Tech.
Phares, D.J., K.P. Rhoads, A.S. Wexler, and M.V. Johnston. 2001.
Size resolved ultrafine particle composition analysis Part 2:
Houston. J. Geophys. Res. In press.
Rhoads, K.P., D.J. Phares, A.S. Wexler, and M.V. Johnston. 2001.
Size-resolved ultrafine particle composition analysis Part1: Atlanta.
J. Geophys. Res. In press.
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Creation and Review Dates
DIF Creation Date: 2003-12-01
Last DIF Revision Date: 2003-12-01