Tracks of very heavy ions in polymers

被引:58
作者
Apel, P [1 ]
Schulz, A [1 ]
Spohr, R [1 ]
Trautmann, C [1 ]
Vutsadakis, V [1 ]
机构
[1] GESELL SCHWERIONENFORSCH MBH,D-64291 DARMSTADT,GERMANY
关键词
D O I
10.1016/S0168-583X(97)00389-3
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
A comparative study of latent and etched track parameters in various polymers is performed with the emphasis on the tracks of very heavy particles such as U-238 ions in the energy range of 1-11.6 MeV/u. Samples of polyethylene terephthalate (PET), polypropylene (PP) and polysulphone (PSU) films were irradiated with heavy ions of various masses. The etching kinetics of the tracks in PET were investigated by a conductometric technique. The sizes of a highly damaged ''track core'' and a cross-linked ''halo'' were derived from the kinetics of the etching curves for the ions of various masses. The ratio of track to bulk etch rate, V, was determined as a function of the ion energy loss, dE/dx. In the case of PP a distinct maximum of the V(dE/dx) function at dE/dx = 7 keV/nm was observed. No profound increase of V was observed when passing from Xe to U tracks in both PET and PSU. Obviously, at very high energy losses the destruction and construction processes coexist and the relative role of construction increases at a certain level of dE/dx. The experimental data seem to indicate that accelerated ions of moderate masses are favoured for the production of structures with a high aspect ratio.
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页码:55 / 63
页数:9
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