Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 25, Issue 49, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/25/49/495504
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Funding
- Office of Nuclear Nonproliferation Research and Engineering [NA22]
- US Department of Energy
- Department of Energy's Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory
- Sandia Corporation
- Lockheed Martin Corporation
- US Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
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We use density functional theory calculations to characterize the electronic and structural properties of the Tl and Na dopant centers in CsI. We find that the Tl and Na centers can accept one or two electrons and couple to long-range relaxations in the surrounding crystal lattice to distort strongly off-center to multiple distinct minima, even without a triplet excitation. The long-range distortions are a mechanism to couple to phonon modes in the crystal, and are expected to play an important role in the phonon-assisted transport of polarons in activated CsI and subsequent light emission in this scintillator.
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