AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
Development of Single Particle Mass Spectrometer Coupled with Light Scattering Module to Increase the Detection Efficiency
HEE-JOO CHO, Taewan Son, Donggeun Lee, Kihong Park, Gwangju Institute of Science and Technology
Abstract Number: 477 Working Group: Instrumentation and Methods
Abstract In this research, we developed a new single particle mass spectrometer (SPMS) coupled with light scattering module to determine size resolved chemical composition of individual particles as well as chemical mixing state. The SPMS consist of four major parts: aerodynamic lens inlet, light scattering module, single step laser desorption/ionization system, and positive mode of linear time-of-flight mass spectrometer. The new aerodynamic lens system was used to focus 30 nm-10 μm sized particles, based on theoretical calculation. The light scattering module was used to measure optical particle diameter and to trigger ionization laser. We used a Nd:YAG laser with a 266 nm wavelength and the maximum frequency of 20 Hz for particle ionization to achieve high hitting efficiency. The laser power was ~1 – 10 mJ/pulse, and its power density is ~106 W/cm2 at laser focal point. The light scattering module in the SPMS was calibrated and evaluated by using various sized PSL particles. Finally, the SPMS was applied to determine chemical constituents and mixing state of individual particles generated from various combustion process such as cooking, biomass burning, coal combustion, and diesel exhaust in laboratory. The mass spectrum achieved from the SPMS will be sub-classified by C-means-OPTICS and K-means algorithm for the further analysis.