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Formation of highly oxygenated organic molecules from -pinene photochemistry / Sungah Kang. Jülich : Forschungszentrum Jülich GmbH, Zentralbibliothek, Verlag, [2021] ; copyright: 2021
Content
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Declaration of Authorship
Acknowledgements
Abstract
Introduction
Highly oxygenated organic molecules
Volatile Organic Compounds in the atmosphere
Secondary Organic Aerosol (SOA)
Highly Oxygenated organic Molecules (HOM)
HOM formation: atmospheric VOC oxidation by OH and O3
Atmospheric oxidants
Classical photochemistry and peroxy radicals
Autoxidation and HOM formation
Importance of alkoxy radicals
Goals of the thesis
Experiments and Methods
Experimental setup
Jülich Plant Atmosphere Chamber (JPAC)
Experiment descriptions
Chemical Ionisatiton Mass Spectrometer (CIMS)
Introduction of the CIMS
Calibration of detected HOM
Data Evaluation
High resolution peak analysis
CIMS analyzer
Families and markers
Kendrick mass defect plot
Corrections and assumptions
Corrections for turnover and particle surface in NOx experiments
Assumptions
Photochemical oxidation of -pinene: Dependency on OH concentration and effect of CO and small peroxy radicals
Ozonolysis of -pinene
Mass spectrum of -pinene ozonolysis
Comparison of mass spectra of -pinene ozonolysis in different experiments
Photochemical oxidation of -pinene: Dependency on OH concentration
Effect of increasing turnover on the concentration of sum of HOM, monomers and accretion products
Changes of families with increasing turnover
Closer look into families: Marker analysis
C10 peroxy radical marker analysis
C20 marker analysis
C10 marker analysis
Photochemical oxidation of -pinene: Effect of CO
Mass spectrum comparison
Monomer and accretion product comparison
The effect of CO on C10 and C20 families
The effect of CO on C10 and C20 marker compounds
C10 peroxy radicals
C20 marker compounds
C10 marker compounds
Photochemical oxidation of -pinene: Effect of isoprene
Photochemical oxidation of -pinene: Impact of NOx
Monomer HOM pattern change
Fragmentation
Accretion product suppression
Alkoxy-peroxy pathway
Family analysis
Concluding the effect of NOx on -pinene photooxidation
Summary, conclusion and outlook
Bibliography
Peaklists
-pinene OH oxidation
-pinene OH oxidation in the presence of CO
-pinene OH oxidation in the presence of isoprene
-pinene OH oxidation in the presence of NOx
CIMS analyzer
CIMS analyzer
Abbreviation
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