Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1814792 | Physica B: Condensed Matter | 2008 | 7 Pages |
Abstract
We report the inelastic neutron scattering (INS) measurements of the density of vibrational states G(ω) of two perfluoropolyether (PFPE) oils which differ by chemical composition, molecular weight and solidification temperatures. Interpretation of vibrational bands observed in the energy transfer range 0.5–200 meV is based on the density functional theory (DFT) ab initio modeling of structure and dynamics of molecular clusters of investigated PFPE. These polymers have turned out promising for the storage of ultra-cold neutrons (UCN) in closed volumes covered with PFPE film. From inferred G(ω) we calculate the expected UCN loss coefficients and compare them with the existing experimental data.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Yu.N. Pokotilovski, I. Natkaniec, K. Holderna-Natkaniec,