Positrons in doped pyrene
Literature Information
Tomasz Goworek, Czesław Rybka, Jan Wawryszczuk
It was shown that the annihilation of free positrons produces a momentum distribution of annihilating pairs which is narrower for doped pyrene than for pure pyrene. We propose to explain this effect by enhanced annihilation on guest molecules; the enhancement factor for phenanthrene as admixture is of the order of 25. The increased annihilation probability on admixtures is not correlated with the respective effective numbers of electrons participating in annihilation per molecule (Zeff) observed in collisions of slow positrons with free molecules in vacuum.
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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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