Direct determination of transient molar absorption coefficient by double pulse excitation
Literature Information
A new method has been devised to determine the molar absorption coefficient of short-lived photochemical species formed by laser irradiation. The technique consists of a first pump excitation pulse that significantly modifies the concentration of the initial species in its ground state, enough that the variation of the absorbance at maximum absorption of the formed species depends on the initial species concentration. A new absorbance variation is created by a second excitation pulse occurring with a time delay after the first pulse that is small compared to the lifetime of the formed species. The molar absorption coefficient is calculated using the ratio of these two variations in absorbance, assuming that the initial species does not absorb in the spectral range where the absorption variation of the formed species is observed.
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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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