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Page • Complex chemical reaction networks like those that occur in combustion and in atmospheric chemistry can contain thousands of interlocked chemical transformations. Frequently, important aspects of the overall chemistry depend on a few key reactions, for example, the chain-branching reactions that increase the number of reactive free radicals and drive hydrocarbon...

Page • Technical Details Figure 1 Oxidation turns hydrocarbons into water and carbon dioxide through an interconnected web of reactions. The hydrocarbon’s molecular structure and the conditions of oxidation, such as temperature, pressure, and composition, profoundly impact phenomena ranging from air quality to engine performance. In this aspect of our chemical physics...

Page • Technical Details Figure 1 Research and development efforts both inside and outside the Labs are aimed at providing a fundamental understanding of cryogenic hydrogen dispersion and flames. Experiments are used to validate models that are, in turn, used to inform safety, codes and standards for infrastructure that uses liquid hydrogen,...

Page • Figure 1 Figure 1 Shown here is the virtually accessible laser-heated stagnation flow reactor (LSFR) for characterizing redox chemistry of materials under extreme conditions. The LSFR is equipped with a solid-state laser to replicate the high energy flux and rapid heating rates that materials encounter in a concentrating solar reactor....

Page • Sensitive cavity-enhanced absorption spectrometry for gas-phase chemical kinetics Figure 1 (Left) SULI intern Zachary Decker operates the time-resolved broadband cavity-enhanced absorption spectrometer under the mentorship of PI Leonid Sheps. (Right) The time-resolved UV absorption spectrum of Criegee intermediate CH2OO Technical Details Absorption of photons from the IR to the UV...

Page • Low-temperature gasoline combustion (LTGC) strategies encompass both homogeneous and stratified charge compression ignition (HCCI and SCCI) combustion  technologies. These technologies achieve high, diesel-like efficiencies and very low emissions of NOx and particulate. In an LTGC engine, the piston compresses a dilute, premixed fuel/air charge that autoignites and burns volumetrically. The charge...

Page • At the CRF, researchers apply the power of mass analysis to investigate the details of complex chemical reaction networks such as those that drive combustion, autoignition, and tropospheric autoxidation.” Development and application of synchrotron photoionization methods have proved particularly powerful, and the CRF has benefited from a close collaborative relationship...

Page • The interaction of gas phase molecules with other phases bridges two systems—condensed phase and gas phase—that are described by different paradigms of chemical physics. Our research in multiphase systems focuses on understanding how these regimes affect each other and the nature of the intermediary region between the phases. Two areas...

Page • Figure 1 Gas-surface interfaces are present in many important chemical systems.  From the valorization of methane at catalytically active surfaces, to the impinging of combustion processes on chemically inert interfaces, the complex heterogeneous chemistry and molecular energy transfer processes occurring in the gas phase very near to interfaces must be...

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Page • Chemical reactions give rise to nascent products, termed non-equilibrium (NE), whose energy distribution does not correspond to that of either the reactants or the bath. Such NE product ensembles have different effective reactivity relative to their thermal equivalents, thereby impacting important macroscopic quantities in a complex reactive system. NE products...