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Development of an Atmospheric Pressure Ionization Source for in Situ Monitoring of Degradation Products of Atmospherically Relevant Volatile Organic Compounds

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Development of an Atmospheric Pressure Ionization Source for in Situ Monitoring of Degradation Products of Atmospherically Relevant Volatile Organic Compounds Development of an Atmospheric Pressure Ionization source for in situ monitoring of degradation products of atmospherically relevant volatile organic compounds Dissertation submitted to the FB C of the Bergische Universität Wuppertal in partial fulfillment of the requirements for the degree Doctor of Natural Science in Chemistry (Dr. rer. nat.) by Hendrik Kersten born in Bielefeld, Germany Wuppertal, January, 2011 Diese Dissertation kann wie folgt zitiert werden: urn:nbn:de:hbz:468-20110418-092806-6 [http://nbn-resolving.de/urn/resolver.pl?urn=urn:nbn:de:hbz:468-20110418-092806-6] „Auch aus Steinen, die einem in den Weg gelegt werden, kann man was Schönes bauen.“ J.W. von Goethe Für Kalle, Aenne und Josche Acknowledgements There are many people who have helped and encouraged me in numerous ways throughout the work described in this thesis. I wish to express my deepest thanks to: … Prof. Dr. Thorsten Benter for being my thesis supervisor, for giving me the opportunity to work in his group, for giving me valuable guidance throughout the course of my study, and finally, for proofreading this thesis draft. His deep insights and positive manner have always been helpful and encouraging. … Prof. Dr. Rob O´Brien for giving me the opportunity to work in his laboratory, for the many inspiring ideas, for his valuable practical guidance, and for his and his family´s kind hospitality. … Davin Carter for the productive and wonderful time in the laboratory, and for showing me life in Kelowna outside the University. … Dr. Ian Barnes for his great advice concerning the characteristics and interpretation of degradation product studies. … the work shop of the university of Wuppertal, in particular Jörg Richling, who eventually became an expert in drilling holes into glass capillaries, and Axel Brakelmann for his helpfulness regarding any technical question. … Hartlauer Präzisions Elektronik GmbH, in particular Peter Seckl, who fortunately did not give up on me regarding electronic challenges. … Bruker Daltonik GmbH, Bremen, in particular Dr. Andreas Brekenfeld for technical advice concerning the ion trap, and Dr. Armin Holle for his commitment in purchasing a DPSS laser. … Resonance Ltd., in particular Dr. Bill Murray who let me trustfully use his laboratory for VUV measurements. … PD Dr. Jörg Kleffman for valuable discussions. … Ronald Giese for his commitment to put the weirdest ideas into technically realizable setups. … Regina Rosenkranz for all the valuable administrative advice. … Detlef Fuchs for building the trigger circuits of the power supplies. … Walter Wißdorf for the fluid dynamical simulations, for valuable discussions, and for a great time spent together in the laboratory and the office. … Dr. Ralf Kurtenbach for his helpfulness in any questions concerning where to find things. … Dr. Klaus Brockmann for his continuing helpfulness in any kind, and for all the valuable discussions. … Matthias Lorenz for valuable discussions and for a great time spent together in the laboratory and the office. … Anne Heinrich for not killing me when I crashed her spectrometer and for a great time spent together in the office. … Sonja Klee for a great time spent together in the laboratory and the office. … Willi Nelsen for his helpfulness in purchase order processing. … Valerie Derpmann for the shared work on NRITPs that eventually led to a great bachelor thesis, for all the valuable discussions, and for a great time spent together in the laboratory and the office. … Robin Brüning for his helpfulness in any kind of glass machining and glass blowing. … the German Research Foundation (DFG) for financial support of this thesis under contracts BE 2124/6-1and BE 2124/4-1. … Elena, Kalle, Aenne and Josche for supporting me, for fortunately distracting me from work, for keeping me on the right track, and for helping me remembering that there are more things in life than writing a thesis. Abstract In this work a Bruker esquire6000 quadrupole ion trap mass spectrometer, originally equipped with a typical atmospheric pressure ion (API) source design (Apollo™), was coupled to a smog chamber for in situ monitoring of degradation product formation of atmospherically relevant volatile organic compounds (VOC), in particular aromatic hydrocarbons (AH). Atmospheric Pressure Photo Ionization (APPI) and Atmospheric Pressure Laser Ionization (APLI) were used for ion generation, with the latter being sensitive and selective towards “ring- retaining” degradation products. Comprehensive studies of the fluid dynamical behavior of the commercially available API source revealed that chaotic, turbulent flows prevailing in the source enclosure cause ion residence times exceeding one second. The conventional assembly additionally restricts the ionization volume for APLI and leads to an insufficient use of the ionizing laser radiation. Hence, the application of this type of source design was deemed inappropriate for the intended gas-phase sampling from atmospheric degradation product studies. Consequently, a novel API source design, based on a tube system, was developed. It is characterized by an essentially laminar sample gas stream, solely determined by the choked flow of the mass spectrometer capillary. This setup shows well-defined fluid dynamical behavior and high ion transmission efficiencies. For APLI applications the sample is irradiated along the downstream propagation of the sample gas flow, which entails significant increase in ionization volume and thus ionization efficiencies compared to common APLI assembles. As a result, the replacement of the commonly used exciplex laser as radiation source with a compact, significantly smaller, and more cost efficient diode pumped solid state laser (DPSS) became feasible. Herewith, detection limits of anthracene in the lower pptV range were obtained. For APPI applications a specially shaped lithium fluoride window was mounted onto the inlet tube assembly allowing for efficient vacuum ultra violet (VUV) irradiation perpendicular to the sample gas stream. Theoretical, experimental, as well as computational investigations in terms of the fluid dynamical behavior, ion production and ion transport characteristics of this “laminar-flow ion source (LFIS)” are presented. This design was filed as patent application in 2009. A considerable part of this work is concerned with the occurrence of ion transformation processes (ITP) in API-MS, in particular ITPs induced by in situ generated neutral radicals. The significant impact of ITPs on the signal ion distribution, the loss of mass spectrometric information, and the consequences for data interpretation particularly with respect to unknown compositions is demonstrated. The impact of bi-and termolecular ITPs called for an entirely redesigned APPI approach. Herein, VUV irradiation of the sample gas stream occurs further downstream within the transfer capillary of the mass spectrometer. In this way the time between the ionization step and enter into the collision free region is reduced by a factor of 250, whereas the analyte density is only reduced by a factor of four, compared to common API assemblies. This approach required opening of the capillary. Consequently, this new stage was thoroughly characterized in terms of fluid dynamical behavior and ion transmission efficiencies. Furthermore, commercially available APPI lamps did not allow efficient irradiation of the capillary gas flow. Therefore home-built, windowless miniature argon spark discharge lamps were successfully developed. The lamps are precisely mounted on the transfer capillary and deliver VUV radiation on a small well-defined illuminated area. With this new APPI approach lower detection limits of 0.1 ppbV for 2-butanone and 0.5 ppbV for benzene were obtained. A comprehensive characterization of the lamp in terms of the discharge properties and the emitted VUV radiation is presented. The result of significantly reduced ITPs and thus preservation of mass spectrometric information is demonstrated. This design was filed as patent application in 2011. An exemplary study on p-xylene demonstrates the capabilities of this setup for in situ mass spectrometric monitoring of atmospheric degradation products. Table of Contents Table of Contents Table of Contents ...................................................................................................................... i Notation and Terminology ...................................................................................................... vi 1 Introduction ......................................................................................................................... 1 1.1 Atmospheric Chemistry ................................................................................................... 1 1.1.1 Laboratory studies .................................................................................................... 2 1.2 Mass Spectrometry .......................................................................................................... 3 1.2.1 Atmospheric Pressure Ionization (API) ................................................................... 4 1.2.1.1 Atmospheric Pressure Laser Ionization (APLI) ................................................ 4 1.2.1.2 Atmospheric Pressure Photo Ionization (APPI) ................................................ 5 1.2.1.3 Negative Ion Formation (NIF) .......................................................................... 6 1.2.1.4 Ion Transformation Processes (ITP).................................................................
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