A laser induced fluorescence technique for determining the pH of water droplets and probing uptake dynamics
文献信息
Robert M. Sayer, Robert D. B. Gatherer, Jonathan P. Reid
A new experimental approach is demonstrated for probing the uptake dynamics of aerosols. By seeding liquid aerosol droplets with a pH sensitive dye, the laser induced fluorescence (LIF) spectrum can be used to unambiguously and directly determine the droplet pH. Droplets larger than 15 μm in radius are studied in this work. Measurements show that for these size droplets, the fluorescence spectrum is independent of droplet size and conforms to that obtained in bulk phase measurements. Fluorescence lifetime measurements support the conclusion that the measurements are inherently bulk phase in character. By using cavity enhanced Raman scattering, the size of the droplets being sampled is accurately determined. The velocity of the droplets is determined from elastic light scattering measurements. In a droplet train apparatus in which the gas phase composition can be accurately controlled, the LIF technique is used to investigate the uptake of ammonia by acidic water droplets with varying ammonia partial pressure and exposure time.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.














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