Note: A combined aerodynamic lens/ambient pressure x-ray photoelectron spectroscopy experiment for the on-stream investigation of aerosol surfaces.
We discuss a new approach for the measurement of the surfaces of free aerosol particles with diameters from 50 to 1000 nm. Particles in this size range have significant influence on the heterogeneous chemistry in the atmosphere and affect human health. Interfacing an aerodynamic lens to an ambient pressure x-ray photoelectron spectrometer permits measurement of the surface chemical composition of unsupported aerosol particles in real time. We discuss the basic considerations for the design of such an instrument, its current limitations and potentials for improvement. Results from a proof-of-principle experiment on silicon oxide particles with average diameters of 270 nm are shown.
Mysak
Erin R
ER
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Starr
David E
DE
Wilson
Kevin R
KR
Bluhm
Hendrik
H
D000336:Aerosols / Q000737:chemistry*; D007909:Lenses; D053758:Nanoparticles / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D056951:Photoelectron Spectroscopy / Q000295:instrumentation* / Q000379:methods*; D011312:Pressure; D017655:Silicon Compounds / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013997:Time Factors; D014867:Water / Q000737:chemistry
D000336:Aerosols; D010087:Oxides; D017655:Silicon Compounds; D014867:Water; D012822:Silicon Dioxide