Insights into Mechanisms of Secondary Organic Aerosol Formation: Approaching Atmospherically Relevant Conditions in an Atmospheric Reaction Chamber / Yarê Baker. Wuppertal, 2024
Inhalt
- List of Illustrations
- List of Tables
- List of Abbreviations
- Acknowledgement
- 1. Introduction
- 1.1 Atmospheric oxidation of volatile organic compounds and secondary organic aerosol formation
- 1.2 Objective
- 2. Theoretical Background
- 2.1 Generic α-pinene HOM peroxy radical chemistry
- 2.1.1 Reaction pathways of HOM-RO2 with RO2 and HO2
- 2.1.2 Reaction pathways of HOM-RO2 with NOx
- 2.1.3 Reaction pathways of HOM alkoxy radicals
- 2.2 Oxidation product gas-to-particle partitioning
- 3. Methods and Experiments
- 3.1 Chemical Ionization Mass Spectrometry
- 3.1.1 Atmospheric Pressure Interface Time of Flight Mass Spectrometer
- 3.1.2 Multi-scheme chemical ionization inlet
- 3.1.3 General procedure for data analysis
- 3.1.4 Determination of oxidized compounds and HO2 with MION-CIMS
- 3.1.5 Derivation of condensable HOM mass proxy in the gas-phase from CIMS-measurement
- 3.2 Atmospheric reaction chamber SAPHIR-STAR
- 4. Results and Discussion
- 4.1 Impact of high HO2
- 4.1.1 Impact of HO2 on overall HOM formation
- 4.1.2 Impact of HO2 on the HOM-RO2 concentration
- 4.1.3 C10-HOM-RO2 chemistry: Importance of C10H15Ox and C10H17Ox families
- 4.1.4 Impact of HO2 on HOM alkoxy radical formation
- 4.1.5 Impact on carbonyl and hydroperoxide formation
- 4.1.6 Impact of HO2 on condensable organic mass
- 4.1.7 Summary: Impact of HO2
- 4.2 Impact of NO
- 4.2.1 Impact on overall HOM formation
- 4.2.2 Impact of NO on the HOM-RO2 concentration
- 4.2.3 C10-HOM-RO2 chemistry: Importance of C10H15Ox and C10H17Ox families
- 4.2.4 Importance of HOM alkoxy chemistry in the system with NO
- 4.2.5 Formation of HOM organic nitrates
- 4.2.6 Impact of NO on condensable organic mass
- 4.2.7 Summary: Impact of NO
- 4.3 Combination of NO and high HO2
- 4.3.1 Reduction of HOM formation in the system with NO and high HO2
- 4.3.2 Impact of NO and high HO2 on the HOM-RO2 concentration
- 4.3.3 C10-HOM-RO2 chemistry: Importance of C10H15Ox and C10H17Ox families
- 4.3.4 Competition for termination group formation in the system with NO and high HO2
- 4.3.5 Changes in HOM alkoxy radical chemistry in the system with NO and high HO2
- 4.3.6 Impact of combined NO and high HO2 on condensable organic mass
- 4.3.7 Summary: Impact of NO and high HO2 in combination
- 5. Summary and Conclusion
- 5.1 Impact of HO2 and NO on HOM formation chemistry
- 5.2 Impact of changed HOM formation chemistry on SOA formation
- 6. References
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