Investigation of hydrogen depletion of organic materials upon ion beam irradiation by simultaneous micro-RBS and micro-ERDA techniques

摘要

Radiation stability investigations in a form of hydrogen depletion of organic materials induced by a focussed 1.6 MeV He~+ scanning ion beam within a beam intensity range of 10-50 pA/μm~2 is reported. The hydrogen depletion was measured by applying Elastic Recoil Detection Analysis (ERDA) and Rutherford Backscattering Spectrometry (RBS) techniques, simultaneously. H-count rates were measured and further processed as a function of the deposited ion beam fluence. Our results show, that within the deposited fluence range of 10~(14)-10~(15) ions/cm~2 both the Kapton-foil and porphyrin complex (Fe(III)TPP) do not suffer from hydrogen depletion process, indicating only minor chemical structural changes. There is a slight decrease of the hydrogen content of the Mylar-foil while a remarkable loss of hydrogen occurs in case of poly(dimethyl-siloxane) (PDMS) suggesting the degradation of the polymer chain. A full description of our versatile and complex particle detection system for nuclear microprobe applications is also given in the paper.