Service
Marmara Positron / Positronium Research and Service Laboratory (MARPOS)
Marmara Positron/Positronium Laboratory was established to reveal the structural defects of materials.
Author
UGUR YAHSI
Professor in the Department of Physics at Marmara University
Marmara University
Türkiye
Potential applicant for a funded RTDI project
I am an expert in defect analysis using positron techniques: positron annihilation lifetime spectroscopy and Doppler broadening spectroscopy.
My organisation
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About Marmara University
Founded in 1883, Marmara University stands as one of Türkiye’s most prestigious educational and research institutions. Located in the vibrant city of Istanbul, our university is renowned for its commitment to academic excellence, innovation, and critical thinking.
We offer a broad spectrum of undergraduate, graduate, and doctoral programs, supported by a distinguished faculty composed of experts and thought leaders across a wide range of disciplines. Our dynamic learning environment empowers students with the knowledge, skills, and global perspective needed to thrive in an increasingly interconnected world.
At Marmara University, we are not only shaping the future of our students—we are also contributing to the advancement of society through cutting-edge research, international collaboration, and a deep-rooted tradition of academic leadership.
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About me
Dr. Uğur Yahşi
Professor of Physics
Marmara University, Istanbul, Turkiye
Dr. Uğur Yahşi is a professor of physics at Marmara University, Istanbul. He earned his B.Sc. in Physics from Istanbul University (1983), M.Sc. from the University of Wisconsin–Madison (1988), and Ph.D. from Case Western Reserve University (1994). His research lies at the intersection of the statistical thermodynamics of polymers and positron/positronium physics, combining theoretical and experimental approaches.
Dr. Yahşi specializes in the use of Positron Annihilation Lifetime Spectroscopy (PALS) and Doppler Broadening Spectroscopy (DBS) to investigate vacancy-type defects in materials—ranging from bulk solids to thin films and nanostructures. His laboratory at Marmara University is equipped with a fast-fast coincidence system for PALS and variable energy positron beam systems for surface and near-surface studies of materials such as coatings and films.
His current research focuses include:
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Defect formation in ion-irradiated materials
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Free volume effects in Li battery components
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Vacancy defects in Mg/B co-doped ZnO nanoparticles
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Defects in bovine hydroxyapatite
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Theoretical modeling of free volume behavior in relation to viscosity, ionic conductivity, and relaxation in chain molecular systems using statistical thermodynamics
Dr. Yahşi actively engages in interdisciplinary research, fostering collaboration across materials science, condensed matter physics, and energy storage technologies.
My organisation
Marmara University
Additional questions
I am interested in the following CETPartnership thematic areas:
provide technological cleaner solutions for storage technologies