IR-laser ablation of species from growing soot particles and their detection through mass spectrometry

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Conference4th International Workshop and Meeting on Laser-Induced Incandescence: Quantitative Interpretation, Modeling, Application, April 18-20, 2010, Varenna, Lecco, Italy
AbstractFor the modeling and application of LII it is of interest to know whether there are species ablated from soot particles during IR irradiation, what kind of species are involved in these processes, and at which fluences the ablation occurs. This is highly demanded as current LII models for non-negligible sublimation conditions are not well predictive for the first tens of nanoseconds and strongly vary among different LII models [1]. A photolonization mass spectrometer, modified to allow IR and UV interrogation of a soot laden molecular beam and subsequent analysis of the ionized products, was employed to explore these questions. Autoionization Cn clusters were observed as a product of IR irradiation, while neutral ablation products were not detected via IR+UV conditions. A new size class of particles in the range of 1000 to 3000 amu appears promptly after IR excitation. These particles are most likely fragments of soot rather than agglomerates of Cn clusters.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology
Peer reviewedYes
NRC number52107
NPARC number16131771
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Record identifiercb14ed01-4bb0-4547-9ad1-05dc2eb245ca
Record created2010-09-28
Record modified2016-05-09
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