Measurements of pressure broadening coefficients of selected transitions in the 2ν5 band of formaldehyde
Literature Information
A tunable diode laser and a low finesse optical cavity are used to probe formaldehyde on four selected rotational transitions within its 2ν5 overtone band around 1.76 μm by cavity enhanced absorption spectroscopy (CEAS). Pressure broadening coefficients for these transitions in the presence of a variety of gases (He, Ne, Ar, Kr, N2, O2 and H2O, and also for CH2O itself) have been determined. The variation in the pressure broadening cross sections with molecular parameters of the colliding partners is discussed in terms of multipole interactions and compared with previous results and with inelastic collision probabilities. For the rare gases the pressure broadening parameters are shown to be strongly correlated with the intermolecular well depth between CH2O and each collider.
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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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