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Mass Spectrometry of Refractory Black Carbon Particles from Six Sources: Carbon-cluster and Oxygenated Ions : Volume 13, Issue 10 (24/10/2013)

By Corbin, J. C.

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Book Id: WPLBN0003996457
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: Mass Spectrometry of Refractory Black Carbon Particles from Six Sources: Carbon-cluster and Oxygenated Ions : Volume 13, Issue 10 (24/10/2013)  
Author: Corbin, J. C.
Volume: Vol. 13, Issue 10
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Sierau, B., Gysel, M., Keller, A., Laborde, M., Corbin, J. C., Mensah, A. A.,...Onasch, T. B. (2013). Mass Spectrometry of Refractory Black Carbon Particles from Six Sources: Carbon-cluster and Oxygenated Ions : Volume 13, Issue 10 (24/10/2013). Retrieved from http://community.ebooklibrary.org/


Description
Description: ETH Zurich, Institute for Atmospheric and Climate Science, Switzerland. We discuss the major mass spectral features of different types of refractory carbonaceous particles, ionized after laser vapourization with an Aerodyne High-Resolution Soot-Particle Aerosol Mass Spectrometer (SP-AMS). The SP-AMS was operated with a switchable 1064 nm laser and a 600 °C thermal vapourizer, yielding respective measurements of the refractory and non-refractory particle components. Six samples were investigated, all of which were composed primarily of refractory material: fuel-rich and fuel-lean propane/air diffusion-flame combustion particles; graphite-spark-generated particles; a commercial Fullerene-enriched Soot; Regal Black, a commercial carbon black; and nascent aircraft-turbine combustion particles.

All samples exhibited a spectrum of carbon-cluster ions Cxn+ in their refractory mass spectrum. Smaller clusters (x<6) were found to dominate the Cxn+ distribution. For Fullerene Soot, fuel-rich-flame particles and spark-generated particles, significant Cxn+ clusters at x≫6 were present, with significant contributions from multiply-charged ions (n>1). In all six cases, the ions C1+ and C3+ contributed over 60% to the total C1<x<16+ intensity. Furthermore, the ratio of these major ions C1+/C3+ could be used to predict whether significant Cxn+ signals with x>5 were present. When such signals were present, C1+/C3+ was close to 1. When absent, C1+/C3+ was <0.8. This ratio may therefore serve as a proxy to distinguish between the two types of spectra in atmospheric SP-AMS measurements.

Significant refractory oxygenated ions such as CO+ and CO2+ were also observed for all samples. We discuss these signals in detail for Regal Black, and describe their formation via decomposition of oxygenated moieties incorporated into the refractory carbon structure. These species may be of importance in atmospheric processes such as water uptake, aging and heterogeneous chemistry.


Summary
Mass spectrometry of refractory black carbon particles from six sources: carbon-cluster and oxygenated ions

Excerpt
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