Abstract
Variable Energy Positron Annihilation Lifetime Spectroscopy (VE-PALS) experiments on polyimide material Kapton are reported. Thin Kapton foils are widely used in a variety of mechanical, electronic applications. PALS provides a sensitive probe of vacancy-related defects in a wide range of materials, including open volume in polymers. Varying the positron implantation energy enables direct measurement of thin foils. Thin Kapton foils are also commonly used to enclose the positron source material in conventional PALS measurements performed with unmoderated radionuclide sources. The results of depth-profiled positron lifetime measurements on 7.6 µ m and 25 µ m Kapton foils are reported and determine a dominant 385(1) ps lifetime component. The absence of significant nanosecond lifetime component due to positronium formation is confirmed.
Original language | English |
---|---|
Article number | 025305 |
Number of pages | 3 |
Journal | Journal of Physics D: Applied Physics |
Volume | 49 |
Issue number | 2 |
DOIs | |
Publication status | Published - 20 Jan 2016 |
Fingerprint
Dive into the research topics of 'Positron annihilation lifetime spectroscopy study of Kapton thin foils'. Together they form a unique fingerprint.Profiles
-
Keeble, David
- Physics - Professor (Teaching and Research) of Condensed Matter and Materials
Person: Academic