Positron lifetime experiments of high statistical accuracy were performed for various polyethylene samples with different degrees of crystallinity (Xc = 43, 60, and 70%). Four lifetime components were resolved using the MELT, CONTIN or the discrete-term LIFSPECFIT routines. Two long-lived components appeared, their lifetimes and intensities varied systematically with Xc. τ4 arose from o-Ps annihilation in holes of the amorphous phase while τ3 may be attributed to crystals.
|Journal||Physica Status Solidi (A) Applied Research|
|Number of pages||13|
|Publication status||Published - 01.04.1999|